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- [41] Electron ionization induced mass spectral study of new isomeric 2-o-(m- and p-)nitrobenzylthio-5-piperidino-methyl(morpholinomethyl)uracils and 1,2-di-o-(m- and p-)nitrobenzyl-5-piperidino-methyl(morpholinomethyl)-2-thiouracils RAPID COMMUNICATIONS IN MASS SPECTROMETRY, 2006, 20 (04) : 713 - 718