| 19,21,22,24-tetrakis(acetyloxy)-20-[(acetyloxy)methyl]-25-hydroxy-3,13,14,25-tetramethyl-6,15-dioxo-2,5,16-trioxa-11-azapentacyclo[15.7.1.0<sup>1,20</sup>.0<sup>3,23</sup>.0<sup>7,12</sup>]pentacosa-7,9,11-trien-18-yl 1-methyl-6-oxo-1,6-dihydropyridine-3- |
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