31. Typical simple aromatic compounds are benzene and indole. 32. :: Even the high-end freeze dried stuff is going to lose lots of those aromatic compounds . 33. Furthermore, there are varying levels of sensitivity and recognition thresholds among humans of some aromatic compounds . 34. Perpendicular and offset parallel configurations can be observed in the crystal structures of many simple aromatic compounds . 35. The former's reaction all include an aromatic compound so the name should be changed to the latter. 36. Although PAHs clearly are aromatic compounds , the degree of aromaticity can be different for each ring segment. 37. Except for aromatic compounds , unsaturated hydrocarbons are highly reactive and undergo addition reactions to their multiple bonds. 38. Typical aromatic compounds are benzene and toluene. 39. The first proposed mechanism for a thermal rearrangement of an aromatic compound was for the automerization of naphthalene. 40. Thionine is a partially aromatic compound .