What is the chemical formula for rennet?

Rennet is not a single compound with a specific chemical formula; rather, it is a complex mixture of enzymes, primarily composed of chymosin (rennin) and pepsin, along with various other proteins. Chymosin, the main enzyme in rennet, has a molecular formula of C_23H_39N_7O_6S. The composition of rennet can vary depending on its source, which can be animal-derived (usually from calf stomachs) or microbial.