Patent ID: 7205412

Claim:
An antibiotic additive comprising a compound produced by chemically reacting an antibiotic substance having a structure of the following formula (I) with a predetermined additive, in which, R 1 is any one selected from the group consisting of a hydrogen atom, a hydroxy group, an amino group, a sulfonic acid group and salts thereof, and a phosphoric acid group and salts thereof; and R 2 , R 3 , R 4 , R 5 , R 6 and R 7 are each independently any one selected from the group consisting of, a halogen atom, a hydroxy group, a nitro group, a cyano group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxyl group and salts thereof, a sulfonic acid group and salts thereof, a phosphoric acid group and salts thereof, a substituted or unsubstituted C 1 to C 30 alkyl group, a substituted or unsubstituted C 1 to C 30 alkenyl group, a substituted or unsubstituted C 1 to C 30 alkynyl group, a substituted or unsubstituted C 1 to C 30 heteroalkyl group, a substituted or unsubstituted C6 to C 30 aryl group, a substituted or unsubstituted C 6 to C 30 arylalkyl group, a substituted or unsubstituted C 6 to C 30 heteroaryl group and a substituted or unsubstituted C 6 to C 30 heteroarylalkyl group.