Triangeliphthalides A–D: bioactive phthalide trimers with new skeletons from Angelica sinensis and their production mechanism†
Abstract
Triangeliphthalides A–D (1–4), four novel phthalide trimers with two new linkage styles, were isolated from Angelica sinensis, together with two related phthalide dimers (5–6). Their structures including absolute configurations were determined. The production mechanism of phthalide polymers was proposed, and their bioactivities were also evaluated.