1) O- demetylering af en eller begge sidekæder, efterfulgt af oxidering til carboxylsyre; 2) oxidering af acetylengruppen efterfulgt af hydrolyse til arylcarboxylsyre; og 3) aromatisk hydroxylering af phenyl- acetylengruppen.
1) O-demethylation of either side chain or both, followed by oxidation to the carboxylic acids; 2) oxidation of the acetylene moiety followed by hydrolysis to the aryl carboxylic acid; and 3) aromatic hydroxylation of the phenyl-acetylene moiety.