Case C-691/15 P: Judgment of the Court (Sixth Chamber) of 22 November 2017 — European Commission v Bilbaína de Alquitranes, SA and Others (Appeal — Environment — Regulation (EC) No 1272/2008 — Classification, labelling and packaging of certain substances and mixtures — Regulation (EU) No 944/2013 — Classification of pitch, coal tar, high-temperature — Categories of acute aquatic toxicity (H400) and chronic aquatic toxicity (H410) — Duty to act diligently — Manifest error of assessment)