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PubChem is a database of chemical molecules and their activities against biological assays. The system is maintained by the National Center for Biotechnology Information (NCBI), a component of the National Library of Medicine , which is part of the United States National Institutes of Health (NIH).
The standard search allows querying for systematic names, trade names and synonyms and registry numbers; The advanced search allows interactive searching by chemical structure, chemical substructure, using also molecular formula and molecular weight range, CAS numbers, suppliers, etc. The search can be used to widen or restrict already found ...
Large databases, such as PubChem [11] [20] and ChemSpider, [21] have graphical interfaces for search. The Chemical Abstracts Service provides tools to search the chemical literature and Reaxys supplied by Elsevier covers both chemicals and reaction information, including that originally held in the Beilstein database. [22]
Search. Search. Appearance. ... They all have formula C 10 H 8 O 2 and molecular weight 160.172 g ... Melting pt (°C) Boiling pt (°C) CAS number PubChem EINECS ...
There are no rigorous methods for determining the precise size of this space. The assumptions [3] used for estimating the number of potential pharmacologically active molecules, however, use the Lipinski rules, in particular the molecular weight limit of 500. The estimate also restricts the chemical elements used to be Carbon, Hydrogen, Oxygen ...
Columbamine is a chemical with the molecular formula C 20 H 20 NO 4. It is an organic heterotetracyclic compound and a berberine alkaloid. Columbamine can be also called dehydroisocorypalmine. [1] It has a molecular weight of 338.4 g/mol [1] and its monoisotopic mass is 339.1470581677 daltons. [2] Columbamine is soluble in DMSO [3] and is a ...
4-Anisaldehyde, or p-Anisaldehyde, is an organic compound with the formula CH 3 OC 6 H 4 CHO. The molecule consists of a benzene ring with a formyl and a methoxy group. It is a colorless liquid with a strong aroma.
The solubility of another chlorine solvent, carbon tetrachloride, at 0 °C is about 30% (3.11 mol/L). One mole of C 4 Cl 6 can dissolve more chlorine than one mole of CCl 4, but the molecular weight difference between the two solvents is such that per liter of solvent, more chlorine can be dissolved in carbon tetrachloride. Shown below is the ...