1-N-Methylpiperazine-2-chloro-4-nitroisoquinoline 19559-37-6 3-Chloro-1-(4-methyl-1-piperazinyl)-5-nitroisoquinoline GO-230 ISOQUINOLINE, 3-CHLORO-1-(4-METHYL-1-PIPERAZINYL)-5-NITRO-