The C-25 terpenoid moenocinol is suggested to originate from a farnesyl pre
cursor and geranyl pyrophosphate. The new mechanism is in accord with all p
revious feeding experiments. Feeding of [2,5-C-13(20)]-labeled 1-deoxy-D-xy
lulose proves how the two units are joined in the course of the moenucinol
biosynthesis. (C) 2001 Published by Elsevier Science Ltd.