in an isolated , pressure-volume work performing guinea-pig heart preparation cardiac effects of three histaminergic compounds ( na,5-dimethylhistamine ( hc1 ) 2 , 5-ethyl-na-methyl-histamine ( hc1 ) 2 , na , na-dimethyl-histamine ( hc1 ) 2 ) were examined .
C0025779
methyl-histamine
C0019588
histamine