guaiacols 1-hydroxy-2-methoxybenzenes 120.021 120.106 2-methoxyphenol 2-methoxyphenol derivative 2-methoxyphenol derivatives 2-methoxyphenols Any phenol carrying an additional methoxy substituent at the ortho-position. C1(=C(C(=C(C(=C1*)*)*)OC)O)* C7H4O2R4 CHEBI:134251 CHEBI:13645 MetaCyc:Guaiacols a guaiacol catechol monomethyl ether catechol monomethyl ethers chebi_ontology o-methoxyphenol o-methoxyphenols ortho-methoxyphenol ortho-methoxyphenols monomethoxybenzene phenols