Ascomycin; FK520; (1R,9S,12S,13R,14S,17R,18E,21S,23S,24R,25S,27R)-17-ethyl-1,14-dihydroxy-12-[(1E)-1-[(1R,3R,4R)-4-hydroxy-3-methoxycyclohexyl]prop-1-en-2-yl]-23,25-dimethoxy-13,19,21,27-tetramethyl-11,28-dioxa-4-azatricyclo[22.3.1.0?,?]octacos-18-ene-2,3,10,16-tetrone; CAS No.: 104987-12-4; (1R,9S,12S,13R,14S,17R,18E,21S,23S,24R,25S,27R)-17-ethyl-1,14-dihydroxy-12-[(1E)-1-[(1R,3R,4R)-4-hydroxy-3-methoxycyclohexyl]prop-1-en-2-yl]-23,25-dimethoxy-13,19,21,27-tetramethyl-11,28-dioxa-4-azatricyclo[22.3.1.0?,?]octacos-18-ene-2,3,10,16-tetrone (CAS 104987-12-4) exemplifies ChemShuttle s custom compound synthesis for macrocyclic polyketides. This azatricyclooctacosene (CAS 104987-12-4) is synthesized via custom compound synthesis for antibiotic and anticancer research. As a CRO chemical synthesis provider, ChemShuttle ensures CAS 104987-12-4 s structural fidelity for natural product studies.