A phenolic compound of general formula (1) [wherein X's are each independently a group of general formula (2) (wherein R1 and R4 are each independently C1-C8 alkyl; and R2, R3, R5 and R6 are each independently H or C1-C8 alkyl)]; a stabilizer for organic materials comprising the phenolic compound; a composition comprising the compound and an organic material; a composition comprising them and a sulfur antioxidant; and uses thereof. The phenolic compound exhibits a more excellent inhibitory effect against the oxidative degradation of organic materials, particularly the degradation of an organic material in prolonged contact with hot water, than those of the conventional hot-water resistant antioxidants. Further, the simultaneous use of the compound with a sulfur antioxidant exhibits excellent synergistic effects and is synergistically improved in long-term hot-water resistance as compared with the conventional hot-water resistant antioxidants.