is direct conjugate base of A is a direct conjugate base of B if and only if A is chemical entity that is a Brønsted–Lowry Base (i.e., can receive a proton) and by receiving a particular proton transforms it into B. pyruvate anion (CHEBI:15361) is the conjugate base of the neutral pyruvic acid (CHEBI:32816) is direct conjugate acid of is deprotonated form of Charles Tapley Hoyt