CSCCC1NC(=O)C(Cc2c[nH]c3ccccc23)NC(=O)C(CO)NC(=O)C(C(C)C)NC(=O)C(Cc2ccccc2)NC(=O)C(C(C)C)NC(=O)C(Cc2ccccc2)NC1=O asperheptatide C