instruction:
In this task, you are given a sentence. You are expected to recognize the name of any form of chemical substances. Although there might be several correct answers, you need to write one of them.
question:
The inhibitory effect of the leukotriene receptor antagonist on leukotriene D4-induced MUC2/5AC gene expression and mucin secretion in human airway epithelial cells.
answer:
leukotriene


question:
Drug-protein interactions: isolation and characterization of covalent adducts of phenoxybenzamine and calmodulin.
answer:
phenoxybenzamine


question:
New oral anticoagulants: comparative pharmacology with vitamin K antagonists.
answer:

vitamin K