2909醚、醚醇、醚酚、醚醇酚、过氧化物及其卤化、磺化、硝化或亚硝化衍生物

Ethers, ether-alcohols, ether-phenols, etheralcohol- phenols, alcohol peroxides, ether peroxides, acetal and hemiacetal peroxides, ketone peroxides (whether or not chemically defined), and their halogenated, sulphonated, nitrated or nitrosated derivatives