This regulation establishes an exemption from the requirement of a tolerance for residues of 2-butenedioic acid (2Z)-, monobutyl ester, polymer with methoxyethene, sodium salt, minimum number average molecular weight of (in amu) 18,200 (CAS Reg. No. 205193-99-3) when used as an inert ingredient in a pesticide chemical formulation under 40 CFR 180.960. Steptoe & Johnson, LLP, on behalf of, International Specialty Products submitted a petition to EPA under the Federal Food, Drug, and Cosmetic Act (FFDCA), requesting an exemption from the requirement of a tolerance. This regulation eliminates the need to establish a maximum permissible level for residues of 2-Butenedioic acid (2Z)-, monobutyl ester, polymer with methoxyethene, sodium salt, on food or feed commodities.