5-(TERT-BUTOXYCARBONYL)-4,5,6,7-TETRAHYDROPYRAZOLO[1,5-A]PYRAZINE-3-CARBOXYLIC ACID CAS:1280214-48-3 5-(TERT-BUTOXYCARBONYL)-4,5,6,7-TETRAHYDROPYRAZOLO[1,5-A]PYRAZINE-7-CARBOXYLIC ACID CAS:1823815-24-2 |