CH3CH2CH2CH2COOHCH3CH2CH（CH3）COOHCH3CH（CH3）CH2COOHCH3C(CH3)2COOHHCOO(CH2)3CH3HCOOCH(CH3)CH2CH3HCOOCH2CH2(CH3)2HCOOC(CH3)3CH3COO(CH2)2CH3CH3COOCH(CH3)2CH3CH2COOCH2CH3CH3CH2CH2COOCH313.(CH3)2CHCOOCH...