Showing structure for (1r,3r,4r,7r,9r,10r,12r,13r,19r,21r,23s,27s)-4,9,23,27-tetrahydroxy-12,19-dimethyl-5-oxo-6,25,26-trioxatetracyclo[19.3.1.1⁴,⁷.1¹⁰,¹³]heptacosa-15,17-dien-3-yl butanoate