[(2r,3s,6s,7r,8r)-3-[(3-formamido-2-methoxybenzoyl)amino]-8-hexyl-2,6-dimethyl-4,9-dioxo-1,5-dioxonan-7-yl] Butanoate;[(2r,3s,6s,7r,8r)-3-[(3-formamido-2-methoxybenzoyl)amino]-8-hexyl-2,6-dimethyl-4,9-dioxo-1,5-dioxonan-7-yl] 2-methylpropanoate