Abstract. An X-ray crystal structure analysis of 9,9a-dihydro-1,9,9-trimethyl-2-methylene-3,10-diketo-9a-mercapto-piperazino[ 1,2-a]indole (1) shows a boat conformation for the piperazinedione ring in this compound. This observation supports the previously suggested Zn' + chelate 3 as an intermediate in the conversion of 1 into 2. Crystals of 1 are monoclinic, a = 12.751 (7) A, b = 7.439 (2) A, c = 15.324(15) A, p = 98.73 (6)"; space group: P2,/n, 2 = 4. In solution at room temperature 1 dimerizes to 4 with loss of one molecule of H,S.
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