[2-(2-Acetoxy-ethyl)-8-(morpholine-4-sulfonyl)-1,3-dioxo-2,3-dihydro-1H-pyrrolo[3,4-c]quinoline-4-sulfinyl]-acetic acid methyl ester

6-(morpholine-4-sulfonyl)-2-oxo-1,2-dihydro-3,4-quinolinedicarboxylic acid

Acetic acid 2-[4-hydroxy-8-(morpholine-4-sulfonyl)-1,3-dioxo-1,3-dihydro-pyrrolo[3,4-c]quinolin-2-yl]-ethyl ester

[2-(2-Acetoxy-ethyl)-8-(morpholine-4-sulfonyl)-1,3-dioxo-2,3-dihydro-1H-pyrrolo[3,4-c]quinolin-4-ylsulfanyl]-acetic acid methyl ester

6-(morpholine-4-sulfonyl)furo[3,4-c]quinoline-1,3,4(5H)-trione