L-Proline, 4-[[3-[(2E)-1,1-difluoro-4-hydroxy-2-buten-1-yl]-2-quinoxalinyl]oxy]-, methyl ester, (4R)-

L-Proline, 4-[[3-[(2E)-1,1-difluoro-4-hydroxy-2-buten-1-yl]-2-quinoxalinyl]oxy]-, methyl ester, (4R)- · CAS 1878109-26-2