1,2-Cyclobutanedicarboxylic acid, 3,4-diphenyl-, bis(2-methoxycarbonyl)-8-methyl-8-azabicyclo(3.2.1)oct-3-yl ester, stereoisomer 490-15-3 Bis(2-methoxycarbonyl)-8-methyl-8-azabicyclo(3.2.1)oct-3-yl 3,4-diphenyl-1,2-cyclobutanedicarboxylate stereoisomer Isococamine beta-Truxilline delta-Isoatropylcocaine