eskalin eskalin v micamicina mikamycin mikamycine mikamycinum ostreogricina ostreogrycin ostreogrycine ostreogrycinum pristinamicina pristinamycin pristinamycine pristinamycinum pyostacine stafac stafytracine staphylomycin stapyocine starfac streptogramin vernamycin virgimycin virgimycine virginiamicina virginiamycin virginiamycina virginiamycine virginiamycinum