13201-13-3 17278-28-3 19-Norlanosta-5,23-diene-2,11,22-trione, 25-(acetyloxy)-3,16,20-trihydroxy-9-methyl-, (3alpha,9beta,10alpha,16alpha,23E)- 2-EPICUCURBITICIN B CUCURBITCIN B, 2-EPI- Isocucurbitacin B NSC 106400 epi-Isocucurbitacin B