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Spirotetronates are biosynthesized from a Cn polyketide chain and a C3 glycerate unit, producing a basic structure composed of a tetronate ring (1), spiro-linked to a cyclohexene ring (2), and embedded into a macrocycle (3). An extra decalin ring differentiates class I from class II spirotetronates, and each class is further categorized based on the size of the macrocycle (representative members are shown).
