tautomeric

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective tautomeric is

(chemistry) of, relating to, formed or characterized by tautomerism.

As an adjective tautomeric

is of, relating to, formed or characterized by tautomerism.

As a noun malondialdehyde is

the dialdehyde propane-1,3-dial that normally exists in the tautomeric enol form.