(2aS,4R,8bR)-1-Benzyl-5-hydroxy-6,8-dimethoxy-7-methyl-2-oxo-1,2,2a,3,4,8b-hexahydro-1,3-diaza-cyclobuta[a]naphthalene-4-carboxylic acid methyl ester

(2aS,4R,8bR)-1-Benzyl-5-benzyloxy-4-benzyloxymethyl-6,8-dimethoxy-7-methyl-2a,3,4,8b-tetrahydro-1H-1,3-diaza-cyclobuta[a]naphthalen-2-one

(2aS,4R,8bR)-1-Benzyl-5-benzyloxy-4-benzyloxymethyl-3-[(S)-3-(3-hydroxy-4-methoxy-5-methyl-phenyl)-2-methylamino-propionyl]-6,8-dimethoxy-7-methyl-2a,3,4,8b-tetrahydro-1H-1,3-diaza-cyclobuta[a]naphthalen-2-one

(3S,4R)-3-Amino-1-benzyl-4-(5-hydroxy-2,4-dimethoxy-3-methyl-phenyl)-azetidin-2-one