In order to confirm the structures of momilactones A (3-oxo-9β-pirnara-7,15-dien-19,6p-olide)(I) and B (3,20-epoxy-3α-hydroxy-9β-pimara-7,15-dien-19,6β-olide)(XIII), growth-inhibitors isolated from husk of rice, their chemical and physical properties were studied in detail. Momilactone B gives a rearrangement product (XVII) on treatment with alkali, whereas momilactone A affords a decarboxylation product (X).
T. Kato, H. Aizawa, M. Tsunakawa, N. Sasaki, Y. Kitahara and N. Takahashi, J. Chem. Soc., Perkin Trans. 1, 1977, 250 DOI: 10.1039/P19770000250
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