3921436 EB-GII BD-induced N7-(1-hydroxy-3-buten-2-yl) guanine 2 3921435 EB-GII ESI+-HRMS3 methodology for N7-(1-hydroxy-3-buten-2-yl) guanine 2 3921437 EB-GII extent of inter-individual and inter-species variability in the urinary N7-(1-hydroxy-3-buten-2-yl)guanine 1