Polypropylene screw vials

Abiraterone, and the deuterated stable isotope-labeled D₄-Abiraterone were obtained from Alsachim (Illkirch-Graffenstaden, France). Dimethyl-sulfoxide (DMSO, Seccosolv), and Acetonitrile(ACN) (Lichrosolv) were provided by Merck (Darmstadt, Germany). Formic acid was obtained from Sigma-Aldrich (Zwijndrecht, The Netherlands). High purity Milli-Q water was produced in the laboratory using a MilliQ Gradient water purification system (Millipore, Amsterdam, The Netherlands).
Cellstar Tubes (5 and 50 ml) were provided by Greiner Bio-one (Alphen a/d Rijn, The Netherlands). Polypropylene Screw Vials and Safe Lock Tubes were supplied by Agilent (Amstelveen, The Netherlands) and Eppendorf (Nijmegen, The Netherlands) respectively. EDTA plasma was prepared from EDTA whole blood provided by Sanquin (Amsterdam, The Netherlands).

Enzalutamide, N-desmethylenzalutamide, and the deuterated stable isotope-labeled D₆-enzalutamide were obtained from Alsachim (Illkirch, France); dimethyl-sulfoxide (DMSO, Seccosolv) and acetonitrile (ACN) (Lichrosolv) were purchased from Merck (Darmstadt, Germany). Formic acid was obtained from Sigma-Aldrich (Zwijndrecht, The Netherlands). High-purity Milli-Q water was produced in the laboratory using a MilliQ Gradient water purification system (Millipore, Amsterdam, The Netherlands). Cellstar tubes (5 and 50 mL) were purchased from Greiner Bio-one (Alphen a/d Rijn, The Netherlands). Polypropylene screw vials and safe lock tubes were purchased from Agilent (Amstelveen, The Netherlands) and Eppendorf (Nijmegen, The Netherlands), respectively. Ethylenediaminetetraacetic acid (EDTA) plasma was prepared from EDTA whole blood obtained from Sanquin (Amsterdam, The Netherlands).