英文别名ETC-1002 intermediate; diethyl 2,2,14,14-tetramethyl-8-oxopentadecanedioate; Pentadecanedioic acid, 2,2,14,14-tetramethyl-8-oxo-, 1,15-diethyl ester; Bempedoic Acid Impurity 31; Buprenorphine Impurity 20; Keto Diethyl Ester Impurity of Bempedoic Acid