After researching the provided sources, I found that the invention of sapropterin is not directly attributed to a specific individual or group of individuals in the information given. Sapropterin is a drug used to reduce the symptoms of phenylketonuria (PKU), a genetic disorder, as mentioned in the second source [2]. The drug is a form of tetrahydrobiopterin, a natural substance found in the body [2].

The first source [1] is a website that provides information about drug patents, including sapropterin, but it does not offer details about the invention or inventors of the drug. The third source [3] is a press release from Kuvan, a biotechnology company, celebrating its 10-year anniversary and discussing its history and achievements. However, it does not provide information on the invention or inventors of sapropterin.

In summary, while sapropterin has been developed and is used as a treatment for PKU, the available information does not clearly indicate who invented the drug.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/SAPROPTERIN
[2] https://pubmed.ncbi.nlm.nih.gov/17968763/
[3] https://www.kuvan.com/about-kuvan/10-years/