1 By convention a normal lens on a 35mm film camera (and thus a full-frame EOS digital SLR) has a focal length of 50mm or so. 2  A lens with a focal length of 35mm is considered ânormalâ for a cropped-frame EF-S camera.
Aspirin. One of the best known aromatic acetates is acetylsalicylic acid, or aspirin, which is prepared by the esterification of the phenolic hydroxyl group of salicylic acid. Aspirin possesses a number of properties that make it the most often recommended drug.
All three compounds are aromatic. Aspirin is also a carboxylic acid (CO 2 H) and an ester (CO 2 CH 3). Tylenol is also an alcohol (OH) and an amide (CONH). Ibuprofen contains alkane substituents and a carboxylic acid functional group.ll three compounds are aromatic. Aspirin is also a carboxylic acid (CO 2 H) and an ester (CO 2 CH 3). Tylenol is also an alcohol (OH) and an amide (CONH). Ibuprofen contains alkane substituents and a carboxylic acid functional group.