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Three new alkaloids, reticulatins A (1) and B (2) and hyrtioreticulin F (3), were isolated from the water-soluble fraction of an EtOH extract of the marine sponge Hyrtios reticulatus. Compounds 1 and 2 were found to be novel 1,3-dimethyl-5-(methylthio)imidazolium alkaloids. The structure of 3 was determined to be an indole alkaloid related to hyrtioreticulin E (8) and hyrtioerectine B (9), which were...
Hyrtioreticulins A–E (1–5) were isolated from the marine sponge Hyrtios reticulatus, along with a known alkaloid, hyrtioerectine B (6). Structural elucidation on the basis of spectral data showed that 1, 2, and 5 are new tetrahydro-β-carboline alkaloids, while 3 and 4 are new azepinoindole-type alkaloids. Hyrtioreticulins A and B (1 and 2) inhibited ubiquitin-activating enzyme (E1) with IC 50...
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