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To a solution of 21.9 parts of 2parts of 2-piperidino-4-imino-2-thiazoline hydrochloride in 240 parts of methyl alcohol there was added 14.5 parts of 1,3-diiminoisoindoline. The resultant mixture was heated at reflux for 6 hours, then chilled to 0° C. and filtered. The collected solid was washed with methyl alcohol and dried at 50° C. to obtain 27 parts of 1-imino-3-(2-piperidino-4-imino-2-thiazolin-5-ylidene)isoindoline hydrochloride melting at 320°-321° C. (dec). The assigned chemical structure was completely corroborated by a concordant nuclear magnetic resonance spectrum. The hydrochloride salt is readily converted to the free base, a colorless solid melting at 226°-227° C., by treatment with dilute ammonium hydroxide. This compound, which corresponds to Formula VIII wherein R, R1, R2 and R3 are each hydrogen and N=B is piperidino, was found on testing in vitro by standard serial dilution procedures to be bacteriostatic versus: Staphylococcus aureus 209 at a minimal concentration of 6.3 parts per million; Esherichia coli at 62.5 parts per million; Pseudomonas aeruginosa 211 at 125 parts per million; and fungicidal versus Tricophyton mentogrophytes at 62.5 parts per million; Aspergillus niger at > 125 parts per million; and Candida albicans at 125 parts per million.

1. temperatureat reflux for 6 hours
2. filtrationfiltered
3. washThe collected solid was washed with methyl alcohol
4. customdried at 50° C.