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. 2020 Jan 15;12(1):50. doi: 10.3390/toxins12010050

Figure 3.

Figure 3

(a) Chemical structures of 44-methylgambierone, previously reported as maitotoxin-3 (copied from Murray et al., 2019 [73]). There are two distinct structural types in the P-CTX class: Type I (P-CTX-4A) and Type II (P-CTX-3C). Both contain a 13-ring (A–M) backbone, with the main differences being the aliphatic hydrocarbon chain on C1 (A-ring) for Type I, and the size of the E-ring (seven-membered for Type I and eight-membered for Type II). (b) Chemical structure of maitotoxin-1 (MTX-1: adapted from Murata et al. 1993 [71].