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- [29] Hetero-Diels-Alder reaction of some 1,3-diaza-1,3-butadienes with ketenes. Synthesis of functionalized pyrimido[1,2-b]-benzothiazoles and 1,3,4-thiadiazolo-[3,2-a]pyrimidines MONATSHEFTE FUR CHEMIE, 1996, 127 (12): : 1273 - 1281