The common chemical name for aspirin is acetylsalicylic acid. Its systematic name is 2-(acetyloxy) benzoic acid. This is the information according to Wikipedia and does accurately describe the ACTIVE ingredient in a bottle of Bayer aspirin.
load (plural loads) A burden; a weight to be carried. I struggled up the hill with the heavy load in my rucksack. (figuratively) A worry or concern to be endured, especially in the phrase a load off one's mind.
RE: Design Load & Service Load. The design load of a structure is the probablistic loading of the structure that would put the structure into a failure mode. The service load is the load a structure would see on a daily basis when used as designed. Failure does not mean on the ground.