Topsentinols, 24-isopropyl steroids from the marine sponge Topsentia sp
Jingqiu Dai1, Analia Sorribas, Wesley Y Yoshida
1Department of Chemistry, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA.
Journal of Natural Products
|September 3, 2010
Abstract:
Three isopropyl steroids, topsentinols K, L, and K trisulfate (1-3), were isolated from an undescribed species of Topsentia. The structures of the new compounds were determined by extensive 1D and 2D NMR experiments and mass spectrometry measurements. Topsentinol K trisulfate (3) inhibited the aspartic protease BACE1, although in a detergent-dependent manner suggestive of nonspecific aggregation.


