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Interaction of 1,2,3,4-tetrahydro-4a-methyl-4aH-carbazole with dimethyl acetylenedicarboxylate: a re-examination. Crystal structures of dimethyl 2a,3,4,5,5a,10-hexahydro-10-[(E)-1,2-bismethoxycarbonylvinyl]-5a-methylcyclobuta[j]carbazole-1,2-dicarboxylate and dimethyl 1,2,3,3a,4,5,12b,12c-octahydro-12c-methoxy-4-methoxycarbonylmethylene-12b-methyl-5-oxazepino[3,2,1-jk]carbazole-6,7-dicarboxylate -