Versions of (2)
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Alfentanil (N–[1–[2–(4–ethyl–4,5–dihydro–5–oxo–1H–tetrazol–1–yl)ethyl]–4–(methoxymethyl)–4–piperidyl]propionanilide)
Alfentanil (N–[1–[2–(4–ethyl–4,5–dihydro–5–oxo–1H–tetrazol–1–yl)ethyl]–4–(methoxymethyl)–4–piperidyl]propionanilide)