guaiacols 1-hydroxy-2-methoxybenzenes 0 2-methoxyphenols CHEBI:134251 catechol monomethyl ethers ortho-methoxyphenol 120.02113 catechol monomethyl ether 2-methoxyphenol derivatives o-methoxyphenols 2-methoxyphenol a guaiacol 2-methoxyphenol derivative C7H4O2R4 o-methoxyphenol ortho-methoxyphenols chebi_ontology C1(=C(C(=C(C(=C1*)*)*)OC)O)* Any phenol carrying an additional methoxy substituent at the ortho-position. 120.106 MetaCyc:Guaiacols CHEBI:13645 monomethoxybenzene phenols