| XANTHINE | Crystalline compound that caffeine is derived from |
| CAMPHOR | A volatile, aromatic crystalline compound that is used as a liniment (7) |
| LSD | Crystalline compound derived from ergot |
| MENTHOL | A crystalline compound with a minty taste and smell that is used as a flavouring (7) |
| BORICACID | White crystalline compound derived from borax, used as a mild antiseptic and in the manufacture of heatresistant glass and ceramics (5,4) |
| BASILICAN | Stop nicking crystalline compound from a church |
| UREA | Crystalline compound extracted from cure-all |
| QINGHAOSU | A crystalline compound extracted from the artemisia plant (9) |
| TARTARICACID | Colouriess crystalline compound obtained from grape juice (8,4) |
| CAPSAICIN | Pungent crystalline compound in peppers such as chilli, cayenne and jalapeno that gives them their heat (9) |
| ACID | White crystalline compound occurring in numerous plants and prepared commercially from sodium phenol, used in the manufacture of aspirin, fungicides etc. (9,4) |
| SALICYLIC | White crystalline compound occurring in numerous plants and prepared commercially from sodium phenol, used in the manufacture of aspirin, fungicides etc. (9,4) |
| SANTONIN | White crystalline compound obtained from the wormwood plant Artemisia cina, used medicinally as an anthelmintic (8) |
| AMYGDALIN | Bitter crystalline compound found in almonds (9) |
| MSG | White crystalline compound used as a food additive to enhance flavor. |
| ISATIN | One demonstrated a crystalline compound |
| ALUM | Crystalline compound found in paspalum grass |
| CREAMOFTARTAR | White crystalline compound, made by purifying argol, used in baking |
| ALBUM | Black-hearted crystalline compound snaps here? (5) |
| TETRYL | Explosive crystalline compound (6) |
