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The general cyclic structure of microcystins. The heptapeptide contains the following amino acids: [1] D-Alanine (D-Ala); [2] Variable L-amino acid (X); [3] D-Methyl aspartic acid (D-MeAsp); [4] Variable L-amino acid (Z); [5] 3-amino-9-methoxy-2,6,8-trimethyl-10-phenyldeca-4,6-dienoic acid (Adda); [6] D-Glutamic acid (D-Glu); [7] N-Methyldehydroalanine (Mdha).
