| smiles = CC=1CCCC(C)(C)C=1/C=CC(C)=CC=CC(C)=CC(=O)O | PubChem = 5538 | DrugBank = APRD00362 | C=20 | H=28 | O=2 | | molecular_weight = 300.4412 g/mol | bioavailability = | protein_bound = > 95% | melting_point=180 | metabolism = | elimination_half-life = 0.5-2 hours | pregnancy_category = C(topical), D(oral)(USA), X(oral)(Aus) | legal_status = | legal_AU = S4 | legal_UK = POM | routes_of_administration = Topical, oral }} Tretinoin's the acid form of vitamin A and so also known as all-trans re… (More on Tretinoin)