The compound, or compounds, known as "caffetannic acid" are probably the source of catechol, as the proteins are of ammonia, amins, and pyrrols.
"All About Coffee" by William H. Ukers
It gives the pine-shaving reaction, in this respect resembling pyrrol (q.v.).
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3" by Various