Investigation of adulterated seized heroin samples and direct stereochemical analysis of methorphan by chiral HPLC-MS/MS. - Salerno TMG; Zamengo L; Coppolino C; Cucinotta L; Donato P; Trovato E; Vento F; Zancanaro F; Frison G; Mondello L (Analytical and bioanalytical chemistry, 2025)