incubation of human blood with 0.3 mm sodium nitroprusside ( snp ) or 1 mm potassium cyanide ( kcn ) for 180 min produced a 600-fold increase in red cell cyanide concentration , a 4 % decrease in oxygen capacity and a 6 % increase in oxygen affinity .
C0032826
potassium cyanide
C0010505
cyanide