The Fragment Selection panel offers several fragments in the Unsaturated Cyclic category. The thumbnails in Foldit can be a little hard to see. The larger images on this page show ball-and-stick models of the unsaturated cyclic fragments. The models use CPK colors:
- gray - carbon
- white - hydrogen
- blue - nitrogen
- red - oxygen
- yellow - sulfur
benzene
cyclopentadien
furan
imidazole
isoxazole
oxazole
pyrazine
pyrazole
pyridazine
pyridine
pyrimidine
pyrrole
thiazole
thiophene
triazole