The (22R)-30a,30b-dihomohopan-30b-yl and tetrahymanyl esters of pyroph
aeophorbide a, chlorophyll a transformation products resulting from zo
oplankton herbivory, occur in an extract of surface sediment from Lake
Valencia (Venezuela). The former was identified by HPLC-PDA-MS compar
ison with a standard and the latter after reduction of the extract and
CC-MS analysis of the released alcohols. Copyright (C) 1996 Elsevier
Science Ltd