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General structure of microcystins where X and Z are variable l-amino acid positions. β-d-MeAsp is erythro-β-d-methylaspartate; Mdha, N-methyldehydroalanine, Adda, (2S,3S,8S,9S,4E,6E)-3-amino-9-methoxy-2,6,8-trimethyl-10-phenyl-4,6-decadienoic acid.
