Fig. 1From: Human UDP-glucuronosyltransferase UGT1A4 forms tertiary N-glucuronides predominately with the energetically less favored tautomer of substituted 1H-indazole (benzpyrazole)CID product ion spectra of m/z 439.1 of glucuronides 2 (upper spectrum) and 3 (lower spectrum) magnified by a factor of two. Important MS3 fragments are indicated by dashed arrows Back to article page