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This Special Issue aims to provide an updated overview of the flourishing ongoing research activity in the field of the chemistry of natural and nature-inspired compounds. Ten of the submitted articles were accepted for publication after peer-review. Interestingly, the published papers cover a wide range of chemical reactions, different scaffolds, and several medicinal chemistry applications. Moreover, this Special Issue gathered contributions from all over the world, testifying the international scientific community’s interest in this topic. I would like to sincerely thank the MDPI staff, particularly Jade Lu and the editorial team of Molbank. I am particularly grateful to the authors that decided to share the results of their research by contributing their manuscript to this Special Issue, and, of course, to the reviewers for their valuable help.

Research & information: general --- quercetin --- flavonoids --- semi-synthetic --- PDE --- sildenafil --- molecular modeling --- Garcinia porrecta --- Clusiaceae --- xanthone --- Lansium domesticum --- Meliaceae --- MCF-7 --- triterpene onoceranoid --- hydrazone --- (+)-camphor --- valproic acid --- technology --- terpenoid --- anticonvulsant activity --- 1,2,3-triazole --- anticancer --- aminoquinoline --- hybrid compound --- kokosanolide --- tetranortriterpenoid --- C. dichotoma --- antidiabetic --- α-glucosidase --- α-amylase --- docking --- ADMET --- curcumin analog --- organic synthesis --- photophysical properties --- steady-state fluorescence --- DFT calculation --- 7-hydroxy-2H-chromen-2-one --- O-acylation reaction --- coumarin --- lupeol derivative --- benzylidene derivative --- α-glucosidase inhibition --- Oxone® --- n/a

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This Special Issue aims to provide an updated overview of the flourishing ongoing research activity in the field of the chemistry of natural and nature-inspired compounds. Ten of the submitted articles were accepted for publication after peer-review. Interestingly, the published papers cover a wide range of chemical reactions, different scaffolds, and several medicinal chemistry applications. Moreover, this Special Issue gathered contributions from all over the world, testifying the international scientific community’s interest in this topic. I would like to sincerely thank the MDPI staff, particularly Jade Lu and the editorial team of Molbank. I am particularly grateful to the authors that decided to share the results of their research by contributing their manuscript to this Special Issue, and, of course, to the reviewers for their valuable help.

quercetin --- flavonoids --- semi-synthetic --- PDE --- sildenafil --- molecular modeling --- Garcinia porrecta --- Clusiaceae --- xanthone --- Lansium domesticum --- Meliaceae --- MCF-7 --- triterpene onoceranoid --- hydrazone --- (+)-camphor --- valproic acid --- technology --- terpenoid --- anticonvulsant activity --- 1,2,3-triazole --- anticancer --- aminoquinoline --- hybrid compound --- kokosanolide --- tetranortriterpenoid --- C. dichotoma --- antidiabetic --- α-glucosidase --- α-amylase --- docking --- ADMET --- curcumin analog --- organic synthesis --- photophysical properties --- steady-state fluorescence --- DFT calculation --- 7-hydroxy-2H-chromen-2-one --- O-acylation reaction --- coumarin --- lupeol derivative --- benzylidene derivative --- α-glucosidase inhibition --- Oxone® --- n/a

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The Special Issue "Anticancer Drugs 2021" of Pharmaceuticals is focused on recent significant advances in the design, synthesis, molecular mechanism of action and therapeutic applications of anticancer drugs. This collection of preclinical research papers and reviews includes designed chemotherapeutic agents, targeted therapies and biological agents. The rationalization for the biological activity of these drugs is presented, which helps to guide the design of more effective agents. Structure–activity relationships, together with the biological context in which targets are selected for oncology drug development, are also considered.

Research & information: general --- Chemistry --- thymidylate synthase --- cytotoxicity --- 1,2,3-triazole --- 1,3,4-oxadiazole --- 5-fluoruracil --- pemetrexed --- docking --- 3,4′-bis-guanidino --- 3-amino-4′-guanidino --- diphenyl ether --- phenyl pyridyl ether --- intramolecular hydrogen bond --- cancer cell viability --- HL-60 --- BRAF --- apoptosis --- thieno[2,3-d][1,2,3]triazine --- acetamide --- H1299 --- HER2 --- EGFR --- Bcl-2 inhibitors --- Indole-based analogues --- benzimidazole --- MTT cytotoxic assay --- cell cycle analysis --- DNA fragmentation --- ELISA --- solid/lipid nanoparticles --- phenstatin --- letrozole --- tubulin polymerisation inhibitor --- aromatase inhibitor --- breast cancer --- hybrid molecule --- dual-targeting molecule --- designed multiple ligand --- NaMSA --- cyclophosphamide --- histopathology --- testis --- urinary bladder --- anticancer agents --- enantioselective synthesis --- gastric adenocarcinoma --- tryptophanol --- concentration-guided dosing --- model informed dosing --- physiologically based pharmacokinetics --- sorafenib --- tyrosil-DNA-phosphodiesterase 1 --- adamantane --- resin acid --- TDP1 --- cytotoxic agents --- apoptosis induction --- HT-29 cells --- MDA-MB-231 cells --- mechanism prediction --- STAT inhibitors --- miR-21 --- hydrazide derivatives --- nitrogen scaffolds --- mitoxantrone --- cardiotoxicity --- inflammation --- oxidative stress --- age --- cumulative dose --- Trk --- NTRK --- tissue-agnostic --- larotrectinib --- entrectinib --- Trk fusion --- protein kinase inhibitors --- USFDA --- cancer --- patent review --- generic product --- doxazosin --- MD simulations --- combretastatin A-4 --- cytotoxic activity --- hybrid compounds --- indazole --- mucin --- MUC1 --- MUC16 --- immunotherapy --- cancer vaccine --- CAR (chimeric antigen receptor) --- ADC (antibody-drug conjugate) --- thiourea --- interleukin-6 --- trypan blue assay --- chalcones --- exportin-1 --- covalent binding --- CovDock --- anticancer activity --- xanthone --- in vitro --- in vivo --- isolation --- synthesis --- heterocyclic compound --- benzenesulfonamides --- imidazoles --- alkylated --- colony formation --- tumor spheroids --- HDAC inhibitors --- chalcone --- dual inhibitors --- carvedilol --- kidney --- toxicity --- 7-deaza-4′-thioadenosine derivatives --- multi-kinase inhibitor --- anticancer --- nucleoside --- Imiquimod --- drug efflux --- multidrug resistance --- Toll-Like Receptor --- n/a --- 3,4'-bis-guanidino --- 3-amino-4'-guanidino --- 7-deaza-4'-thioadenosine derivatives

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The health benefits of food, plants, fruits, and seaweeds stem from the biological activities of their constituents—namely, secondary metabolites. The study of secondary metabolites and their potential to treat and/or prevent a number of diseases has become a research topic of growing interest for biologists, pharmacists, and chemists. Notably, in order to propose a compound as a potential new drug with pharmacological effects, the chemical structure of this compound and its biological activity against a given target must be well established. The Special Issue, “Isolation and Identification of Bioactive Secondary Metabolites”, considers species beyond their nutritional value and identifies instances of wider and more efficient use, thereby contributing to a more sustainable management of natural resources. The fifteen articles published in this Special Issue reflect the latest research trends, and consider the isolation, identification, and assessment of the beneficial effects of secondary metabolites from both edible and inedible species. Thus, these contributions collectively demonstrate that these compounds, and their plants of origin, should be valued beyond their nutritional benefits.

Medicine --- Pharmacology --- coumarins --- Lycium --- metabolomic --- HPLC-MS --- orbitrap --- secondary metabolites --- endemic plants --- olive leaves --- supercritical fluid extraction --- antioxidants --- hyperuricemia --- plant-based functional food --- xanthine oxidase --- adenosine deaminase --- uric acid transporter --- bioactive compound --- Piper pseudoarboreum --- bioassay-guided fractionation --- leishmanicidal activity --- alkamides --- (E)-piplartine --- Wedelia chinensis --- organic farming --- phytotoxic substances --- vanillic acid --- gallic acid --- Origanum subspecies --- morphological traits --- glandular trichomes --- essential oil composition --- rosmarinic acid --- sensory evaluation --- colored potato tubers --- total phenols --- anthocyanins --- saccharides --- nutrition --- microelements --- plants --- fungi --- food supplements --- cardiovascular diseases --- neurodegenerative diseases --- Alzheimer’s disease --- metabolic syndrome --- apocarotenoid --- caffeic acid derivative --- flavonoid --- Lactuca sativa --- lignan --- megastigmane --- sesquiterpene lactone --- 1,2,3,4-tetrahydro-β-carboline-3-carboxylic acid --- black chokeberry --- anthocyanin --- simulated moving bed --- antioxidant activity --- neuroprotection --- Artemisia --- clinical trials --- health effects --- adverse effects --- anticancer --- antiparasitic --- artemisinin --- santonin --- achillin --- tehranolide --- Aglaomorpha quercifolia --- GC-MS profile --- rhizome --- leaves --- n-hexane extract --- fatty acids --- terpenoids --- linolenic acid --- hop-16-ene --- cardiac glycosides --- secondary plant metabolites --- natural product isolation --- hyrcanoside --- deglucohyrcanoside --- ouabain --- cymarin --- digitoxin --- anticancer activity --- Na+/K+-ATPase inhibitors --- corn salad --- leafy vegetables --- phytochemicals --- liquid chromatography --- mass spectrometry --- celastrol --- Celastraceae --- antimicrobial activity --- mechanism of action --- Bacillus subtilis --- n/a --- Alzheimer's disease

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The health benefits of food, plants, fruits, and seaweeds stem from the biological activities of their constituents—namely, secondary metabolites. The study of secondary metabolites and their potential to treat and/or prevent a number of diseases has become a research topic of growing interest for biologists, pharmacists, and chemists. Notably, in order to propose a compound as a potential new drug with pharmacological effects, the chemical structure of this compound and its biological activity against a given target must be well established. The Special Issue, “Isolation and Identification of Bioactive Secondary Metabolites”, considers species beyond their nutritional value and identifies instances of wider and more efficient use, thereby contributing to a more sustainable management of natural resources. The fifteen articles published in this Special Issue reflect the latest research trends, and consider the isolation, identification, and assessment of the beneficial effects of secondary metabolites from both edible and inedible species. Thus, these contributions collectively demonstrate that these compounds, and their plants of origin, should be valued beyond their nutritional benefits.

coumarins --- Lycium --- metabolomic --- HPLC-MS --- orbitrap --- secondary metabolites --- endemic plants --- olive leaves --- supercritical fluid extraction --- antioxidants --- hyperuricemia --- plant-based functional food --- xanthine oxidase --- adenosine deaminase --- uric acid transporter --- bioactive compound --- Piper pseudoarboreum --- bioassay-guided fractionation --- leishmanicidal activity --- alkamides --- (E)-piplartine --- Wedelia chinensis --- organic farming --- phytotoxic substances --- vanillic acid --- gallic acid --- Origanum subspecies --- morphological traits --- glandular trichomes --- essential oil composition --- rosmarinic acid --- sensory evaluation --- colored potato tubers --- total phenols --- anthocyanins --- saccharides --- nutrition --- microelements --- plants --- fungi --- food supplements --- cardiovascular diseases --- neurodegenerative diseases --- Alzheimer’s disease --- metabolic syndrome --- apocarotenoid --- caffeic acid derivative --- flavonoid --- Lactuca sativa --- lignan --- megastigmane --- sesquiterpene lactone --- 1,2,3,4-tetrahydro-β-carboline-3-carboxylic acid --- black chokeberry --- anthocyanin --- simulated moving bed --- antioxidant activity --- neuroprotection --- Artemisia --- clinical trials --- health effects --- adverse effects --- anticancer --- antiparasitic --- artemisinin --- santonin --- achillin --- tehranolide --- Aglaomorpha quercifolia --- GC-MS profile --- rhizome --- leaves --- n-hexane extract --- fatty acids --- terpenoids --- linolenic acid --- hop-16-ene --- cardiac glycosides --- secondary plant metabolites --- natural product isolation --- hyrcanoside --- deglucohyrcanoside --- ouabain --- cymarin --- digitoxin --- anticancer activity --- Na+/K+-ATPase inhibitors --- corn salad --- leafy vegetables --- phytochemicals --- liquid chromatography --- mass spectrometry --- celastrol --- Celastraceae --- antimicrobial activity --- mechanism of action --- Bacillus subtilis --- n/a --- Alzheimer's disease