Conformations of some semi-rigid neuroleptic drugs. Part 1. Crystal structures of loxapine, clozapine, and HUF-2046 monohydrate {2-chloro-11-(4-methylpiperazin-1-yl)dibenzo[b,f][1,4]oxazepine, 8-chloro-11-(4-methylpiperazin-1-yl)dibenzo[b,e][1,4]diazepine, and 2-chloro-11(4-methylpiperazin-1-yl)dibenzo[b,e][1,4]diazepine monohydrate}