Tricyclic Diterpenes from the Stem Bark of Azadirachta indica.

  title={Tricyclic Diterpenes from the Stem Bark of Azadirachta indica.},
  author={I Ara and Bina Shaheen Siddiqui and Shaheen Faizi and Sonia Siddiqui},
  journal={Planta medica},
  volume={56 1},
Two new diterpenoids, margosone and margosolone, have been isolated from the stem bark of AZADIRACHTA INDICA A. Juss (neem) and their structures established as 12,13-dihydroxy-14-isoporpylpodocarpa-8,11,13-trien-7-one and 13-hydroxy-12-methoxypodocarpa-8,11,13-trien-7-one, respectively, through chemical and spectroscopic studies. 

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