T. Sano et al., 2 (Z)-DEHYDROBUTYRINE-CONTAINING MICROCYSTINS FROM A HEPATOTOXIC BLOOM OF OSCILLATORIA-AGARDHII FROM SOULSEAT-LOCH, SCOTLAND, Journal of natural products, 61(6), 1998, pp. 851-853
Two (Z)-dehydrobutyrine(Dhb)-containing microcystins, [D-Asp(3), (Z)-D
hb(7)]microcystin-HtyR (1) and [D-Asp(3), (Z)-Dhb(7)]microcystin-LR (2
), were isolated from a hepatotoxic bloom of the cyanobacterium Oscill
atoria agardhii from a freshwater lake in Scotland. The geometrical st
ructure of the Dhb units in the microcystins was determined as Z on th
e basis of NOE and ROESY experiments.