2-Oxapregn-4-ene-3,20-dione(7CI,8CI); 2-Oxaprogesterone; Cyclopenta[5,6]naphtho[1,2-c]pyran-2(4H)-one,7-acetyl-4a,4b,5,6,6a,7,8,9,9a,9b,10,11-dodecahydro-4a,6a-dimethyl-, [4aR-(4aa,4bb,6aa,7a,9ab,9ba)]-
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