| 1 | 998-00-5 | TETRAISOBUTYLDIALUMINOXANE | C16H36Al2O | 298.42 | | |
| 2 | 998-06-1 | 1,2-DILINOLEOYL-SN-GLYCERO-3-PHOSPHOCHOLINE | C44H80NO8P | 782.08 | | |
| 3 | 998-07-2 | 1,2-dimyristoyl-sn-glycero-3-phospho-ethanolamine | C33H66NO8P | 635.853 | 191.0 to 195.0 °C | |
| 4 | 998-09-4 | 2-Propenal, 3-(diethylamino)-2-methyl- | C8H15NO | 141.21 | | |
| 5 | 998-12-9 | 3-hydroxymethylpentane-1,5-diol | C6H14O3 | 134.17 | | |
| 6 | 998-14-1 | Silane, ethyldipropyl- | C8H20Si | 144.33 | | |
| 7 | 998-26-5 | Thioboric acid (H3BS3), triethyl ester (8CI,9CI) | C6H15BS3 | 194.19 | | |
| 8 | 998-27-6 | Germane, tripropyl- | C9H22Ge | 202.91 | | |
| 9 | 998-29-8 | Tri-n-propylsilane | C9H22Si | 158.36 | | |
| 10 | 998-30-1 | Triethoxysilane | C6H16O3Si | 164.27 | -170°C | Insoluble in water. Soluble in organic solvents. |
| 11 | 998-35-6 | 5-propylnonane | C12H26 | 170.33 | -50.8°C (estimate) | |
| 12 | 998-39-0 | Tri-n-Butylgermanium Hydride | C12H28Ge | 244.99 | <0°C | |
| 13 | 998-40-3 | Tri-n-butylphosphine | C12H27P | 202.32 | -65 °C | insoluble |
| 14 | 998-41-4 | tributylsilane | C12H28Si | 200.44 | | |
| 15 | 998-76-5 | 1,2-diiodopentane | C5H10I2 | 323.94184 | 9°C (estimate) | |
| 16 | 998-86-7 | Carbamic acid, (trimethylsilyl)-, ethyl ester | C6H15NO2Si | 161.27 | | |
| 17 | 998-90-3 | 3-[[(Methyl-aci-nitro)acetyl]amino]propenamide | C6H9N3O4 | | | |
| 18 | 998-91-4 | Ethyl 3-Ethoxy-2-Butenoate | C8H14O3 | 158.2 | 30-32°C(lit.) | Insoluble in water. |
| 19 | 998-93-6 | 4-Bromoheptane | C7H15Br | 179.11 | | |
| 20 | 998-94-7 | 4-METHYL-1,5-HEPTADIENE | C8H14 | 110.2 | | |
| 21 | 998-95-8 | 4-CHLOROHEPTANE | C7H15Cl | 134.65 | -69.5°C (estimate) | |
| 22 | 998-97-0 | Butyrimidic acid ethyl ester | C6H13NO | 115.17 | 75-77 °C | |
| 23 | 998-98-1 | Carbamothioic acid, N-ethyl-, O-ethyl ester | C5H11NOS | 133.21 | | |