huh, it does http://en.wikipedia.org/wiki/Opium (go down to the chemical and physiological properties section). says it's 10-16% morphine. i swear i remember reading it was 2-6% morphine on erowid like 6 years ago (i used to sell heaps of the shit...was getting it for less than 3 a gram...source dried up pretty quick. damn was it sweet while it lasted though).