As a result of extensive researches for accomplishing the above object, the inventors have found that {HEAD ~ aminophenol derivatives} in which a hydroxyl group and an amino group are respectively bonded to adjacent ortho positions of an aromatic ring thereof exhibit {TAIL ~ an excellent oxidation inhibiting property} and are effective as a polymerization inhibitor, and in particular, specific bisaminophenol derivatives as novel substances are extremely excellent in oxidation inhibiting property 
exhibit
As a result of extensive researches for accomplishing the above object , the inventors have found that { HEAD ~ aminophenol derivatives } in which a hydroxyl group and an amino group are respectively bonded to adjacent ortho positions of an aromatic ring thereof exhibit { TAIL ~ an excellent oxidation inhibiting property } and are effective as a polymerization inhibitor , and in particular , specific bisaminophenol derivatives as novel substances are extremely excellent in oxidation inhibiting property
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