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.
So the enteric coated (EC) aspirin is the least damaging of all of them to the stomach. Here they are in decreasing order of damage to the stomach (which could lead to stomach bleeding/ulceration): salicylic acid > Acetylsalicylic acid > buffered acetylsalicylic acid > EC acetylsalicylic acid.