New Pentacyclic Cucurbitane Glucosides from the Fruits of Citrullus colocynthis SCHRAD.

[摘要]：Colocynthins A-C (1-3, resp.), new pentacyclic cucurbitane type triterpene glucosides, have been isolated from the AcOEt-soluble fraction of the fruits of Citrullus colocynthis, along with three known compounds, beta-sitosterol 3-O-beta-D-glucopyranoside, elaterinide, and bryoamaride. Their structures were determined on the basis of H-1- and C-13-NMR spectra, DEPT, and COSY, NOESY, HMQC, and HMBC experiments.

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