Abstract
The biogenetic origins of amphidinin A (1) and amphidinolide P (2) were investigated by feeding experiments with (13)C-labeled acetates. (13)C-NMR data of (13)C-enriched samples revealed that the all carbons of 1 and 2 were derived from acetates. The polyketide chain of 1 was formed from one triketide chain, two diketide chains, and three unusual isolated C1 units derived from C-2 of cleaved acetates, while the polyketide chain of 2 was formed from one pentaketide chain, two acetate units, and three unusual isolated C1 units derived from C-2 of cleaved acetates. The all branched C1 units of 1 and 2 were derived from C-2 of cleaved acetates.
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