The pyrimidine ring system is shown below. What is the source of the C-2 during the de novo biosynthesis of pyrimidines? 
Definitions:
Compounded Quarterly
An approach to interest calculation where the earned interest is compounded to the principal quarterly, resulting in the accumulation of interest upon interest.
Repaid
The process of paying back money previously borrowed from a lender.
Payments
The act of transferring money or goods in exchange for a product or service, or the fulfillment of an obligation.
Compound-Interest
Interest calculated on the initial principal, which also includes all of the accumulated interest of previous periods of a deposit or loan.
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