Diterpene derivative and chromone from Hypericum perforatum.

A novel diterpene derivative, 5-methyl-5-(4,8,12-trimethyl-tridecyl)-dihydro-furan-2-one (1) and a new chromone, 5-hydroxy-7-methoxy-3-methyl-chromen-4-one (2), along with a known compound, phytol (3) have been isolated from the aerial parts of Hypericum perforatum. Their structures were established on the basis of spectroscopic analysis and by comparison with published values.

Polyprenylated phloroglucinol derivatives from Hypericum erectum.

Three polyprenylated phloroglucinol derivatives, namely erectquione A, B, and C, were isolated from Hypericum erectum. Their structures were established using extensive spectral methods.