The chemical Cisatracurium besylate has a designated molecular formula of C65H82N2O18S2 and a molecular weight of 1243.487 g/mol. Synonyms may include: Nimbex, Atracurium besylate 1R-cis,1R'-cis form, Nimbex preservative free, UNII-80YS8O1MBS, Cisatracurium Besylate Preservative Free (ChemID).