| Hya - Hydroxx | Nummer |
| Hycanthon | 16 / # (19a+c) |
| Hycanthon-methylsulfonat | 16 / # (19c) |
| Hydnocarpus kurzii | 14 |
| Hydralazin | 14 / 18 |
| Hydramethylnon | 14 |
| Hydrangea | 18 |
| Hydrangea arborescens | |
| Hydrangenol | Selten 18 / # 120 Stark |
| Hydrastin | 14 |
| Hydrastinin | |
| Hydrastis canadensis | 14 / # 227 ++ |
| Hydratrop-aldehyd | 16 |
| Hydratrop-aldehyd-di-methyl-acetal | |
| Hydratrop-alkohol | 14 |
| Hydrazide | |
| Hydrazin | 14 / gelegentlich 18 / 19 19a / # (19b) / # 21 Haut |
| Hydrazin-bis-(3-carboxy-4-hydroxy-benzol-sulfonat) | 14 / 18 / 19a |
| Hydrazin-hydrat | |
| Hydrazinium-bromid | |
| Hydrazinium-di-chlorid | |
| Hydrazinium-hydroxid | |
| Hydrazinium-sulfat | |
| Hydrazin Monohydrat | |
| N,N-Hydrazino-di-essigsäure | 14 / 18 |
| (4-Hydrazino-phenyl)-N-methyl-methan-sulfonamid-hydro- chlorid |
14 / 18 / 19c |
| Hydrazinsalze | 14 / 18 / 19a |
| Hydrazin-tri-nitromethan | |
| Hydrazobenzol | 14 / 10 / 19a |
| Hydroa-bi-etylalkohol | 16 / 18 |
| Hydrochinon | 16 / 13 / 18 / 19 / # (19a-c) / # 6 Augen / # 21 Haut |
| Hydrochinon-bis-(2-hydroxy-ethyl)-ether | 16 |
| Hydrochinon-mono-benzylether | 16 / 18 |
| Hydrochinon-mono-methylether | 16 / 18 / # 104 Wirkt |
| Hydrochloro-thiazid | xxx |
| Hydrocodon | 14 / 18 |
| Hydrocotarnin Hydrobromid | 14 |
| Hydrocumol | 16 |
| Hydrodehydro-linalool | |
| Hydrogen-bromid | 2 |
| Hydrogen-chlorid | 11 / 19 / Über AGW 19b |
| Hydrogen-cyanid | 7 / 19 /
Über MAK 19b / # 21 Haut |
| Hydrogen-iodid | 11 / 18 / 19 |
| Hydrogen-natrium-N-carboxylato-ethyl-N-octadec-9-enyl- maleamat |
16 / 18 |
| Gemisch aus : Hydrogen-, Natrium-, Kalium-7- (((3-aminophenyl)sulfonyl)amino)-naphthalin-1,3-disulfonat |
|
| Hydro-morphinol | 14 |
| Hydro-morphon | |
| 1-Hydro-peroxy-cyclohexyl-1-hydroxy-cyclohexyl-peroxid | xxx |
| S-Hydropren | 16 |
| Hydroxo-[2-(benzol-sulfon-amido)-benzoato]-zink (II) |