Two novel cucurbitacins designated as neocucurbitacins A (1), possessing inhibitory activity of polyoma enhancer binding protein 2alphaA (PEBP2alphaA) and osteoclastogenesis-inhibitory factor (OCIF) gene expression in human osteoblast-like cells, and B (2) were isolated from the fruit of Luffa operculata. Their structures have been determined by extensive spectroscopic investigation.
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Kawahara et al. (2001) studied this question.
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