R1R2COHCOR3

R1R2COHCOR3 represents a general chemical formula for a class of organic compounds. In this notation, R1 and R2 refer to substituent groups attached to one carbonyl carbon atom (C=O). The central part of the formula, COHC, indicates a carbon atom double-bonded to an oxygen atom, single-bonded to a hydrogen atom, and single-bonded to another carbon atom. Finally, COR3 signifies a carbonyl group (C=O) bonded to a substituent group R3.

The structure R1R2COHCOR3 describes a molecule that possesses both an aldehyde functional group (the -CHO part) and a ketone functional group (the R1R2C=O part), and also an ester functional group (the COR3 part). The specific properties of compounds fitting this formula would depend heavily on the nature of the R1, R2, and R3 groups, which can be alkyl, aryl, or other organic fragments. These molecules could exhibit reactivity characteristic of aldehydes, ketones, and esters, and might be involved in various organic reactions such as oxidation, reduction, or nucleophilic addition. Depending on the complexity of the R groups, these compounds could be synthesized through a range of organic transformations.