label: 2R-(n-butyl)-16-methyl-3S,5S,7S,9R,11R,13R,15S,26S, 27R-nonahydroxyoctacosa-16,18,20,22,24-pentaenoic acid, 27-lactone
label_lc: 2r-(n-butyl)-16-methyl-3s,5s,7s,9r,11r,13r,15s,26s, 27r-nonahydroxyoctacosa-16,18,20,22,24-pentaenoic acid, 27-lactone