Phloroglucinol derivatives from Hypericum japonicum

The isolation and identification of a new phloroglucinol derivative (2), a diterpenol (4), together with the known compounds flavesone (1) and sarothr alen B (3); from the aerial parts of Hypericum japonicum are reported. Thei r structures were established by extensive spectral analysis and the struct ure of (3) has also been confirmed by a single crystal X-ray determination. (C) 2000 Elsevier Science Ltd. All rights reserved.