preferred_name: N-[7-[5-[7-(2,4-dioxo-1H-pyridin-3-ylidene)-7-hydroxy-6-methylhepta-1,3,5-trienyl]-3,4-dihydroxy-2-oxolanyl]-6-methoxy-5-methylocta-2,4-dienyl]-2-(2,3,4-trihydroxy-5,5-dimethyl-6-penta-1,3-dienyl-2-oxanyl)butanamide