Two new monogalactosyl diacylglycerols were isolated from the freshwat
er green alga, Chlorella vulgaris, as anti-tumour promoters, together
with three monogalactosyl diacylglycerols and two digalactosyl diacylg
lycerols. The new monogalactosyl diacylglycerol containing (7Z,10Z)-he
xadecadienoic acid showed a more potent inhibitory effect toward tumou
r promotion than the other glycerolipids isolated.