2-Azabicyclo[16.3.1]docosa-1(21),4,6,10,18-pentaene- 3,20,22-trione, 9-[[(amino)carbonyl]oxy]-13-(2-amino- 1-oxoethoxy)-8,14-dimethoxy-4,10,12,16-tetramethyl- 19-[(2-propenyl)amino]-, stereoisomer,hydrochloride Acetic acid, amino-, 9-[[(amino)carbonyl]oxy]-13-(2-amino- 1-oxoethoxy)-8,14-dimethoxy-4,10,12,16-tetramethyl- 3,20,22-trioxo-19-[(2-propenyl)amino]-2-azabicyclo [16.3.1]docosa-1(21),4,6,10,18-pentaen-13-yl ester, stereoisomer, hydrochloride NSC683661