drugbank MI:2002 DrugBank Accession number consisting of the 4 letter prefix and a 5 number suffix. Each Accession number is unique to the drug's generic name. The 4 letter suffix (APRD, EXPT, BIOD, NUTR) indicates the type of drug (APRD=approved small molecule drug, EXPT=experimental drug, BIOD=biotech drug, NUTR=nutraceutical or natural product). Biotech drugs consist of FDA approved peptide, protein or nucleic acid drugs, approved small molecule drugs are FDA approved non-biotech drugs, nutraceuticals are natural products (amino acids, vitamins, other metabolites) and experimental drugs include drugs under trial, pre-clinical drugs, unapproved drugs, well known inhibitors and possible toxins. PSI-MI bioactive entity reference