Budesonide
C25H34O6
430.53
Pregna-1,4-diene-3,20-dione, 16,17-butylidenebis(oxy)-11,21-dihydroxy-,[11b,16a(R)], and 16a,17-[(S)-Butylidenebis(oxy)]-11b,21-dihydroxypregna-1,4-diene-3,20-dione;
(RS)-11b,16a,17,21-Tetrahydroxypregna-1,4-diene-3,20-dione cyclic 16,17-acetal with butyraldehyde
[51333-22-3] S epimer
[51372-28-2] R epimer [51372-29-3]
Pregna-1,4-diene-3,20-dione, 16,17-butylidenebis(oxy)-11,21-dihydroxy-,[11b,16a(R)], and 16a,17-[(S)-Butylidenebis(oxy)]-11b,21-dihydroxypregna-1,4-diene-3,20-dione;
(RS)-11b,16a,17,21-Tetrahydroxypregna-1,4-diene-3,20-dione cyclic 16,17-acetal with butyraldehyde
[51333-22-3] S epimer
[51372-28-2] R epimer [51372-29-3]
DEFINITION
Budesonide is a mixture of two epimeric forms, epimer A (C-22S) and epimer B (C-22R). It contains NLT 40.0% and NMT 51.0% of epimer A, and the sum of both epimers is NLT 98.0% and NMT 102.0% of budesonide (C25H34O6), calculated on the dried basis.
USP REFERENCE STANDARDS FOR PURCHASE
USP Budesonide RSUSP Budesonide Related Compound E RS
USP Budesonide Related Compound G RS
USP Budesonide Related Compound L RS