Two new hydrolyzable tannins, named camptothins A (1) and B (4), have been isolated from the leaf of Camptotheca acuminata (Nyssaceae) along with cornusiin A (2), gemin D (3), tellimagrandin I (5), tellimagrandin II (6), 1, 2, 6-tri-ο-galloyl-β-D-glucose (7) and 1, 2, 3, 6-tetra-ο-galloyl-β-D-glucose (8). Pedunculagin (9) was isolated from the fruit of C. acuminata. The dimeric structures of camptothins A and B have been established based on chemical and spectroscopic evidence.
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Hatano et al. (1988) studied this question.