12319-88-9 29868-84-6 4-Thiazolidinone, 5-acetyl-3-phenyl-2-piperidino-, meso-ionic didehydro deriv. 5-Acetyl-3-phenyl-2-piperidino-4-thiazolidinone meso-ionic didehydro deriv. Thiazolium, 5-acetyl-4-hydroxy-3-phenyl-2-piperidino-, hydroxide, inner salt (8CI)