the antitussive effect of ru-20201 was about 1/10 as potent as that of codeine phosphate in dogs with the puncture electrode-induced cough ( pec ) method and about 1/12 and 1/4 as potent as that of codeine phosphate in guinea pigs with the pec and chemical stimulation methods , respectively .
C0009217
codeine phosphate
C0010200
pec