11012-13-8 28-Nor-8-alpha,9-beta,13-alpha,14-beta-dammara-17(20),24-dien-21-oic acid, 3-alpha,6-alpha,7-beta,16-beta-tetrahydroxy-, 6,16-diacetate, (Z)- 28393-42-2 Cephalosporin P Cephalosporin P1