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