| abstract |
PROBLEM TO BE SOLVED: To provide a novel salt of 5-aminolevulinic acid esters which are hypoallergenic and hardly decomposed in a solution, a production method thereof, a medical composition containing the same, and a plant vital agent composition. The following general formula (1) R 1 OCOCH 2 CH 2 COCH 2 NH 2 ยท HOP (O) (OR 2 ) L (OH) 2-L (1) Wherein, R 1 is hydroxy, alkoxy, acyloxy, alkoxycarbonyloxy, shows amino, aryl, oxo, fluoro, chloro and hydrocarbon radicals groups selected from nitro which may be substituted; R 2 is A hydrogen atom or R 1 ; L represents an integer of 0 to 2; However, when L = 2, the plurality of R 2 may be the same or different.] A 5-aminolevulinic acid ester phosphate represented by [Selection figure] None |