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. 2019 Dec 7;11(12):714. doi: 10.3390/toxins11120714

Figure 1.

Figure 1

General structure of microcystins (MCs) and an overview of their observed structural diversity. R1 = H or CH3; R2 = H or CH3; R3 = H, CH3 or C3H6OH; R4 = H, CH3 or COCH3; X and Z = variable L-amino acids.