121912-19-4 Achatin-I Achatin-II Gfad peptide Gly-delta(Z)-phe(2)-ala-asp Gly-phe-ala-asp Glycyl-phenylalanyl-alanyl-aspartic acid L-Aspartic acid, N-(N-(N-glycyl-D-phenylalanyl)-L-alanyl)- achatin I