| attack nervous system | 0.35 |
| act on wall | 0.30 |
| evaporate into vapor | 0.25 |
| spread into the environ… | 0.24 |
| nerve agent | 0.35 |
| clear, colorless, and t… | 0.16 |
| liquid | 0.16 |
| released | 0.68 |
| produced | 0.66 |
| used in khan sheikhoun | 0.55 |
| used in syria | 0.52 |
| used in attack | 0.50 |
| used in 1995 | 0.50 |
| detected | 0.44 |
| developed in 1938 | 0.44 |
| used in khan shaykhun | 0.39 |
| used on august | 0.25 |
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