The Collaborative International Dictionary of English v.0.48:

opianine \o"pi*a*nine\, n. (Chem.)
   An alkaloid (C22H23NO7) found in small quantity in opium.
   It is identical with narcotine. It is present in amounts up
   to 11% in Papaver somniferum, and is used clinically as an
   antitussive. --MI11

   Syn: noscapine; narcosine; opian.
        [1913 Webster +PJC]

The Collaborative International Dictionary of English v.0.48:

Narcotine \Nar"co*tine\ (n[aum]r"k[-o]*t[i^]n or
   n[aum]r"k[-o]*t[=e]n), n. [Cf. F. narcotine. Cf.
   Cotarnine.] (Chem.)
   An alkaloid found in opium, and extracted as a white
   crystalline substance, tasteless and less poisonous than
   morphine; -- called also narcotia.
   [1913 Webster]