Pharmaceutical IntermediateChina (S) -3, 3-Dimethyl-2- ((1R, 2R)-2-pent-4-ynyl-cyclopropoxycarbonylamino) -Butyric Acid, Tert -Butylamine Salt CAS No: 1425038-21-6, Find details about China 1425038-21-6, L-Valine from (S) -3, 3-Dimethyl-2- ((1R, 2R)-2-pent-4-ynyl-cyclopropoxycarbonylamino) -Butyric Acid, Tert -Butylamine Salt CAS No: 1425038-21-6