[1] UCL Sch Pharm, Dept Pharmaceut & Biol Chem, London WC1N 1AX, England
[2] Univ Cambridge, Dept Psychol, Behav & Clin Neurosci Inst, Cambridge CB2 3EB, England
[3] Univ N Carolina, Chapel Hill Med Sch, Dept Pharmacol, Program Neurosci, Chapel Hill, NC 27514 USA
[4] Univ N Carolina, Chapel Hill Med Sch, Div Chem Biol & Med Chem, Chapel Hill, NC 27514 USA
[5] Univ N Carolina, Chapel Hill Med Sch, Natl Inst Mental Hlth, Psychoact Drug Screening Program, Chapel Hill, NC 27514 USA
[6] LGC Forens, London TW11 0LY, England
[7] Univ Oxford, Dept Pharmacol, Oxford OX1 3QT, England