Dimethiconol can be combined with other molecules, such as the amino acids (arginine, cysteine and methionine) or fatty acids (behenic acid, stearic fatty acids from meadowfoam seed oil) or other compounds to form derivatives of Dimethiconol that are useful as cosmetic ingredients.
Ltd means limited liability, and this designation is implemented when the company starts its processes. An Ltd format is commonly used for small companies that have a limited number of owners, and it can be similarly associated with a Limited Liability Company (LLC) or a corporation.
'co' isn't an actual term nor a type of company. 'corp' is an abbreviation that isn't an actual term nor a type of company. 'Inc' is just short for 'incorporated' but the abbreviation is not a type of company. all of the above refer to a corporation. 'ltd' is mainly UK only. 'llc' is a limited liability company. The best type to use is the one that fits your requirements for your specific business situation.