1H,7H,11H-Cyclopenta[7,8]cyclopropa[4a,4b]phenanthro[2,1-d][1,3]oxazine,6'H-9,19-cyclopregna-3,17(20)-dieno[3,4-d][1,3]oxazin-16-one deriv.;(-)-Sempervirone; Sempervirone
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