Clarithromycin CAS: 81103-11-9 MF: C38H69NO13 MW: 747.95 mp 217-220°C refractive index -92 ° (C=1, CHCl3) storage temp. -20°C Freezer Chemical Properties Colourless Crystalline Needles Usage A semi-synthetic macrolide antibiotic. A derivative of erythromycin Purity: 99% ...