Illicit drug CRM MW [M + H]+ (m/z)
Ketamine hydrochloride 237.72 238.20
Pethidine 247.33 248.30
Cocaine hydrochloride 304.30 303.35
Methandone hydrochloride 310.30 309.3
Diazepam 284.76 285.10
Estazolam 294.74 295.10
Heroin 269.40 370.20
Morphine 285.34 286.30
Methamphetamine hydrochloride 149.20 150.20
Table 4: Molecular weight and its product ion at optimized LC/MS conditions in this study.