There is a paper in Mol Reprod Dev 2015 (Redox and anti-oxidant state within cattle oocytes following in vitro maturation with bone morphogenetic protein 15 and follicle stimulating hormone. Sutton McDowall et al.), where authors analyze NADPH level in oocytes. I would like to apply this procedure in my project. Authors write that they used oxalomalate to dye the oocytes, however there is no producer and catalogue number of this compound in the manuscript. May someone give me some advice where I can find this compound? Or maybe some other procedure suggestions?