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1J. Portilla, J. Quiroga, J. Cobo, J. N. Low and C. Glidewell.
2,5-Dimethyl-6,7-dihydrobenzo[h]pyrazolo[1,5-a]quinazoline and 2-tert-butyl-5-methyl-6,7-dihydrobenzo[h]pyrazolo[1,5-a]quinazoline, Acta Cryst. (2007). C63, o458-o461Â Â Â Â