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get compound formula and structure from https://cactus.nci.nih.gov/chemical/structure
describe(chem, representation = "formula", info = FALSE)
chemical name of the compound
representation methods, formula is default
extra molecular information that users can query
Yonghui Dong
if (FALSE) { describe('malic acid', "formula") describe(c('malic acid', 'citric acid', 'tartaric acid'), "smiles") }
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