4-Carboxy-2-nitrophenylboronic acid (CAS NO.85107-54-6), its Synonyms are 4-Borono-3-nitrobenzoic acid ; 4-Carboxy-2-nitrobenzeneboronic acid ; 4-Carboxy-2-nitrobenzeneboronic acid 97% ; Benzoic acid, 4-borono-3-nitro- . It is off-white cryst.