3,3-dichloro-4-(alpha-chlorobenzyl)-1-methyl-5-phenyl-2-pyrrolidinone, (4alpha(R*),5beta)-(+)(-)-isomer
3,3-dichloro-4-(alpha-chlorobenzyl)-1-methyl-5-phenyl-2-pyrrolidinone, (4alpha(r*),5beta)-(+)(-)-isomer