Selected reaction monitoring (SRM) mass transitions and the collision energies for diclofenac and its metabolites and the ¹³C internal standard.

Compound	SRM transition	CE (V)
DCF	296 → 250 quantifier	22
	296 → 214 qualifier	30
13C6-DCF	302 → 256 quantifier	22
	302 → 220 qualifier	30
Hydroxy-DCF	312 → 266 quantifier	22
	312 → 230 qualifier	30
Cyclo-DCF	278 → 151 quantifier	70
	278 → 214 qualifier	40
	278 → 179 qualifier	60
13C6-Cyclo-DCF	284 → 157 quantifier	70
	284 → 220 quantifier	40
	284 → 185 quantifier	60
Aceclofenac	354 → 250 quantifier	22
	354 → 214 qualifier	30