The structures of sigmosceptrellin-A, -B and -C, three norsesterterpenes constituting the ichthyotoxic fraction of the sponge Sigmosceptrella laevis are represented by formulae 1a, 2a and 3a. 1a, 2a and 3a.
sigmosceptrellin-A,-B和-C的结构,构成海绵状Sigmosceptrella laevis的鱼鳞鱼毒素成分的三个去甲烯脂
萜类化合物由式1a,2a和3a表示。1a,2a和3a。