59
OC-F (Subject) / OC3 (Lesson)
- 4H Pyran http://upload.wikimedia.org/wikipedia/commons/7/73/4H-Pyran.png
- Indazol http://upload.wikimedia.org/wikipedia/commons/3/3d/Indazol.svg
- Indol http://upload.wikimedia.org/wikipedia/commons/0/02/Indol2.svg
- Isoindol http://upload.wikimedia.org/wikipedia/commons/d/db/Isoindol.svg
- Indolizin http://upload.wikimedia.org/wikipedia/commons/2/2d/Indolizin_-_Indolizine.svg
- Purin http://upload.wikimedia.org/wikipedia/commons/1/12/7H-Purine.svg
- Chinolin http://upload.wikimedia.org/wikipedia/commons/2/2c/Chinolin.svg
- Isochinolin http://upload.wikimedia.org/wikipedia/commons/5/5c/Isochinolin.svg
- Chroman http://upload.wikimedia.org/wikipedia/commons/c/cb/Chroman_-_Chroman.svg
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