in carboxylic acid: Hydroxy and keto acids. ...not the same. The 2-hydroxy acids form cyclic dimeric esters (formed by the esterification of two molecules of the acid) called lactides, whereas the 3- and 4-hydroxy acids undergo intramolecular esterification to give cyclic esters called lactones.
VBA's ActiveWorkbook property refers to the workbook with the focus. The active workbook may or may not contain the code that's referencing the active workbook, which is an important distinction. It's perfectly acceptable to use this property to reference the active workbook from code inside the active workbook.
Active records are those documents currently being used by a business unit or department on a daily or monthly basis. These records are retained at the department. If all or part of a record or record series is used on a continual basis, the entire record series is considered active. Typically, if a unit or department needs to reference a record series more than once every three months, it is considered active.