C=CC(C)(C)c1[nH]c2ccccc2c1C=C1NC(=O)[C@@]23[C@@H](CCN2C1=O)[C@@H]1CCN2C(=O)/C(=C/c4c(C(C)(C)C=C)[nH]c5ccccc45)NC(=O)[C@@]123 asperginulin A