3-Chloro-3,4-didehydro-5-oxo-1-valylproline monosodium salt dihydrate 73706-57-7 Antibiotic FR 900148 dihydrate FR 900148 FR-900148 Proline, 3-chloro-3,4-didehydro-5-oxo-1-valyl-, monosodium salt Proline, 3-chloro-3,4-didehydro-5-oxo-1-valyl-, monosodium salt, dihydrate