The methanolic extract from the leaves of Kalanchoe streptantha (Crassulaceae) afforded a new kaempferol 3- O -β-xylopyranosyl-(1→2)-α-rhamnopyranoside 7- O- (4‘‘‘‘- O -acetyl-α-rhamnopyranoside), named 4‘‘‘‘-acetylsagittatin A ( 1 ), and the known sagittatin A ( 2 ). The structures were determined by 1 H- 1 H and 1 H- 13 C COSY NMR and FAB mass spectroscopy and confirmed by analysis of the peracetylated derivative.
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Costa et al. (1996) studied this question.
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