Explanatory notes
… . 2931.10 - Tetramethyl lead and tetraethyl lead 2931.20 - Tributyltin compounds - Non-halogenated organo-phosphorous derivatives : 2931.41 ‑ ‑ Dimethyl methylphosphonate 2931.42 … acid and (aminoiminomethyl)urea (1 : 1) 2931.46 ‑ ‑ 2,4,6-Tripropyl-1,3,5,2,4,6-trioxatriphosphinane 2,4,6-trioxide …