20-hydroxy-3-oxopregn-4-en-21-al => 21-hydroxyprogesterone
20-hydroxy-3-oxopregn-4-en-21-al => 21-hydroxyprogesterone
20-hydroxy-3-oxopregn-4-en-21-al => 21-hydroxyprogesterone
20-hydroxy-3-oxopregn-4-en-21-al => 21-hydroxyprogesterone