Table 3.

MS/MS parameters used in MRM studies.

Compound (C-C phenol coupling type)	MRM parameters (Collision energy) (Declustering potential) (First quadrupole m/z) (Second quadrupole m/z) (Retention time min)
Noroxomaritidine(para'-para)	(35)(70)(272.3)(229.0)(5.3)
N-Demethylnarwedine(para'-ortho)	(35)(70)(272.3)(201.0)(7.9)
4′-O-Methyl-N-methylnorbelladine assay unknown 1(potential para'-para product)	(35)(70)(286.1)(271.0)(4.7)
4′-O-Methyl-N-methylnorbelladine assay unknown 2 (potential ortho'-para product)	(30)(70)(286.1)(243.0)(7.5)
Narwedine(para'-ortho)	(30)(70)(286.1)(229.1)(8.1)