Hydroxyprogesterone caproate

Formula : C27-H40-O4
CAS : 630-56-8 

Drugs@FDA Label: Makena is a progestin indicated to reduce the risk of preterm birth in women with a singleton pregnancy who have a history of singleton spontaneous preterm birth. Limitation of use: Makena is not intended for use in women with multiple gestations or other risk factors for preterm birth.

Hydroxypropentofylline

Formula : C15-H22-N4-O4
CAS : 104317-70-6 

Metabolite of propentofylline.