21-11-4 | (3S)-3-[(4R,6S)-6-[(1E,3E)-4,8-dimethylnona-1,3,7-trienyl]-4-hydroxy-2 ,6-dimethyl-1-cyclohexenyl]-3-hydroxy-propanoic acid | (3S)-3-[(4R,6S)-6-[(1E,3E)-4,8-dimethylnona-1,3,7-trienyl]-4-hydroxy-2 ,6-dimethyl-1-cyclohexenyl]-3-hydroxy-propanoic acid |