[(1s,4as,6r,7s,7as)-4-formyl-4a-hydroxy-7-methyl-1-[(2s,3r,4s,5s,6r)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-5,6,7,7a-tetrahydro-1h-cyclopenta[c]pyran-6-yl] (e)-3-(4-methoxyphenyl)prop-2-enoate