1-Piperazinecarboxylic acid, 6-(7-chloro-1,8-naphtharidin-2-yl)-2,3,6,7-tetrahydro-7-oxo-5H-1,4-dithiino(2,3-c)pyrrol-5-yl ester 59878-27-2 RP 35,489 RP 35489