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PROCEDURE FOR THE PREPARATION OF 4'-DEMETHYL-EPIPODOPHYLLOTOXIN-BETA-D-ETHYLIDENE GLYCOCID AND ACYLER DERIVATIVES THEREOF, AND INTERMEDIATE FOR USING THE PROCEDURE
ALFA- (O-CHLORPHENYL) -AMINOMETHYLENE-BETA-FORMYLAMINOPROPIONITRIL, PROCEDURE FOR PREPARING THIS, AND USING THIS FOR THE PREPARATION OF 2-METHYL-4-AMINYL-5-METHYL-5-METHYL-5-METHYL-5-METHYL