Representative extracted ion chromatographs (MRM) of veratramine, 7-hydroxyl-veratramine and veratramine-3-O-sulfate in a plasma (2 ng/mL of veratramine, 4 ng/mL of 7-hydroxyl-veratramine, and 50 ng/mL of veratramine-3-O-sulfate) and b urine (70 ng/mL of veratramine, 100 ng/mL of 7-hydroxyl-veratramine, and 20 ng/mL of veratramine-3-O-sulfate) after oral administration of 20 mg/kg veratramine; and in incubations of c fRLCs with veratramine in the presence of PAPS (950 ng/mL of veratramine-3-O-sulfate) and d mRLMs with veratramine in the presence of NADPH (20 ng/mL of 7-hydroxyl-veratramine)