Full text
α–Methylthiofentanyl (N–[1–[1–methyl–2–(2–thienyl) ethyl]–4–piperidyl] propionanilide)
α–Methylthiofentanyl (N–[1–[1–methyl–2–(2–thienyl) ethyl]–4–piperidyl] propionanilide)
a–Methylthiofentanyl (N–[1–[1–methyl–2–(2–thienyl) ethyl]–4–piperidyl] propionanilide)