ɹˈɑːsɐɹˌæmɪsˌɪn ɹˈɑːsɐmˌɪsɪn ɪz ɐn ˌæntɪbæktˈɪɹiəl sˈʌbstəns ðæt ɪz kˈɛmɪkli ɐ lˈɪpɪdsˈɑːljuːbəl bˈeɪsɪk mˈækɹəlˌaɪd sˈɪmɪlɚ tʊ ˌɜːɹɪθɹəmˈaɪsɪn bˌʌt wɪð ɐ bˈɛɾɚɹ æktˈɪvᵻɾi ɐɡˈɛnst ɡɹˈæmnˈɛɡətˌɪv bæktˈɪɹiə.
Rosaramicin (rosamicin) is an antibacterial substance that is chemically a lipid-soluble basic macrolide similar to erythromycin but with a better activity against Gram-negative bacteria.