2-Pyridinecarboxylic acid, 5-butoxy-, 1,3-dihydro-3-oxo-1-isobenzofuranyl ester 3-Oxo-1-phthalanyl 5-butoxypicolinate 66933-10-6 BRN 0492546 Picolinic acid, 5-butoxy-, 3-oxo-1-phthalanyl ester