(+)-3R-N-Monomethylamino-4c-phenyl-4t-ethoxycarbonyl cyclohexene-1, d-dibenzoyl-l-tartrate (+)-Nortilidine compd. with (-)-dibenzoyltartaric acid 3-Cyclohexene-1-carboxylic acid, 2-(methylamino)-1-phenyl-, ethyl ester, trans-(+)-, compd. with (R-(R*,R*))-2,3-bis(benzoyloxy)butanedioic acid GW4561666