HPLC detection of 5-methylcytidine - (Apr/12/2014 )

I have DNA of reducing folate concentration digested with Nuclease P1 hoping to show the differences in 5-methylcytidine for my undergrad senior seminar class.  However, I cannot find a place that sells the standard 5-methylcytidine, and therefore, I have no idea which peak it is or if it is even showing. Any ideas on how I can quantify it?

Many people sell it. Sigma, for instance:

http://www.sigmaaldrich.com/catalog/product/sigma/m4254?lang=en&region=US

My bad, I meant 5-methyl-2'deoxycytosine 

Many people sell it:

http://www.chemicalbook.com/ChemicalProductProperty_EN_CB1132913.htm