Trans-4-hydroxy-d-proline Hydrochloride is a medical compound produced by Chengdu Pukang, trans-4-Hydroxy-D-Proline Hydrochloride is a white powder,Trans-4-hydroxy-d-proline Hydrochloride is a medical compound produced by Chengdu Pukang, trans-4-Hydroxy-D-Proline Hydrochloride is a white powder state, our company can customize products according to your needs.The products produced by our company are trusted by customers.And has a certain quality assurance.