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.
Aspirin is a derivative of salicylic acid, making it a member of the salicylate family of compounds. Salicylates are natural compounds found in plants such as the willow tree, and are among the oldest known and widely used therapeutics commonly used to relieve pain, fever, and inflammation.spirin inhibits both COX-1 and COX-2 irreversibly. While COX-2 is the therapeutic target of aspirin, it is aspirin's interaction with COX-1 in the gastrointestinal tract that causes the drug's unwanted side effects. COX-1 is needed to maintain a thick stomach lining.