A qulalitative analysis of papaverine, an opium alkaloid shown carbon,hydrogen and nitrogen.A quantative analysis gave 70.8% carbon,6.2% hydrogen and 4.1% nitrogen.The empirical formula of papaverrine is :
A. `C_(20)H_(20)N_(2)`
B. `C_(20)H_(21)O_(4)N`
C. `C_(10)H_(11)O_(3)N`
D. `C_(21)H_(20)N`
