(3S,6S)-3-(4-Benzyloxy-benzyl)-6-[4-(4-methoxy-benzyloxy)-benzyl]-1-methyl-piperazin-2-one

(3S,6S)-3-(4-Benzyloxy-benzyl)-6-(4-hydroxy-benzyl)-1-methyl-piperazin-2-one

(S)-3-(4-Benzyloxy-phenyl)-2-{(S)-3-[4-(4-methoxy-benzyloxy)-phenyl]-2-methylamino-propylamino}-propionic acid methyl ester

(S)-3-[4-(4-Methoxy-benzyloxy)-phenyl]-2-methylamino-propan-1-ol

{(S)-1-Hydroxymethyl-2-[4-(4-methoxy-benzyloxy)-phenyl]-ethyl}-methyl-carbamic acid tert-butyl ester