Trifluoro-methanesulfonic acid 4-[5-(4-methoxy-benzyloxy)-pent-3-ynyl]-oxazol-2-yl ester

5-[2-(3-Methoxycarbonylamino-prop-1-ynyl)-oxazol-4-yl]-pent-2-ynoic acid (1R,3S,5R,7R,9R,13R,15S,18S)-3-methoxy-18-methyl-13-((E)-4-methyl-pent-1-enyl)-11-oxo-12,19,20-trioxa-tricyclo[13.3.1.15,9]icos-7-yl ester

5-[2-(3-Methoxycarbonylamino-prop-1-ynyl)-oxazol-4-yl]-pent-2-ynoic acid