(1S,4R)-1-[(acetyloxy)methyl]-2-(tert-butoxycarbonyl)-2,3,3a,4,4a,5,6,7,8,9a-decahydro-1H-benzo[f]isoindole-4-carboxylic acid 2H-benz[f]isoindole-2,4-dicarboxylic acid, 1-[(acetyloxy)methyl]-1,3,3a,4,4a,5,6,7,8,9a-decahydro-, 2-(1,1-dimethylethyl) ester, (1S,4R)- InChI=1/C21H31NO6/c1-12(23)27-11-17-15-9-13-7-5-6-8-14(13)18(19(24)25)16(15)10-22(17)20(26)28-21(2,3)4/h9,14-18H,5-8,10-11H2,1-4H3,(H,24,25)/t14?,15?,16?,17-,18-/m1/s