| 4-Hydroxyifosfamide DBMET00024 |  | Not Available | aldoifosfamide |  | Details |
| 4-Hydroxyifosfamide DBMET00024 | | Not Available | 4-Thioifosfamide |  | Details |
| 4-Hydroxyketamine DBMET00192 |  | Not Available | 4-Hydroxynorketamine |  | Details |
| 4-hydroxymethyl ambrisentan DBMET00460 |  | Not Available | 4-hydroxymethyl ambrisentan glucuronide |  | Details |
| 4-hydroxymidazolam DBMET00446 |  | Cytochrome P450 3A4 / Cytochrome P450 3A5 | 1,4-dihydroxymidazolam |  | Details |
| 4-hydroxymidazolam DBMET00446 | | UDP-glucuronosyltransferase 1A4 | 4-hydroxymidazolam-N-glucuronide |  | Details |
| 4-hydroxymidazolam DBMET00446 | | UDP-glucuronosyltransferase 2B4 / UDP-glucuronosyltransferase 2B7 | 4-hydroxymidazolam-O-glucuronide |  | Details |
| 4-Hydroxypropofol DBMET00193 |  | Not Available | 4-Quinol sulfate |  | Details |
| 4-Hydroxypropofol DBMET00193 | | UDP-glucuronosyltransferase 1A8 / UDP-glucuronosyltransferase 1A9 | 1-Quinol glucuronide |  | Details |
| 4-Hydroxyretinoic acid DBMET00298 |  | Cytochrome P450 3A7 / Cytochrome P450 2C18 / Cytochrome P450 4A11 / Cytochrome P450 2B6 / Cytochrome P450 2C8 / Cytochrome P450 2A6 / Cytochrome P450 26A1 | 4-Oxoretinoic acid |  | Details |
| 4-Hydroxyropivacaine DBMET03532 |  | Not Available | 4-OH-PPX |  | Details |
| 4-Hydroxytamoxifen DBMET00030 |  | UDP-glucuronosyltransferase 1A8 / UDP-glucuronosyltransferase 1A10 / UDP-glucuronosyltransferase 2B7 / UDP-glucuronosyltransferase 2B15 | Tamoxifen Glucuronides |  | Details |
| 4-Hydroxytamoxifen DBMET00030 | | Cytochrome P450 3A4 / Cytochrome P450 3A5 | Endoxifen (4-hydroxy-N-desmethyltamoxifen) |  | Details |
| 4-Hydroxytamoxifen DBMET00030 | | Sulfotransferase 1A1 / Sulfotransferase 1E1 | 4-hydroxytamoxifen sulfate |  | Details |
| 4-hydroxytamoxifen sulfate DBMET00737 | | Sulfotransferase 1A1 / Sulfotransferase 1E1 | Endoxifen (4-hydroxy-N-desmethyltamoxifen) | | Details |
| 4-Hydroxyvalproic acid DBMET00063 |  | Not Available | 2-n-Propyl-4-oxopentanoic acid |  | Details |
| 4-Hydroxyvoriconazole DBMET00072 |  | Not Available | 4-Hydroxyvoriconazole 4-O-glucuronide |  | Details |
| 4-methyl-amino-antipyrine (MAA) DBMET03541 |  | Not Available | 4-formyl-amino-antipyrine (FAA) |  | Details |
| 4-methyl-amino-antipyrine (MAA) DBMET03541 | | Cytochrome P450 3A4 / Cytochrome P450 2B6 / Cytochrome P450 2C8 / Cytochrome P450 2C9 | 4-amino-antipyrine (AA) |  | Details |
| 4-O-demethyl deoxaglycone doxorubicinol DBMET03628 |  | Not Available | Demethyldeoxaglycone doxorubicinol 4-O-sulfate |  | Details |
| 4-O-demethyl deoxaglycone doxorubicinol DBMET03628 | | Not Available | Demethyldeoxaglycone doxorubicinol 4-O-b-glucuronide |  | Details |
| 4-O-demethyl deoxaglycone doxorubicinol DBMET03628 | | Not Available | Demethyldeoxaglycone doxorubicinol 4-O-sulfate | | Details |
| 4-O-demethyl deoxaglycone doxorubicinol DBMET03628 | | Not Available | Demethyldeoxaglycone doxorubicinol 4-O-b-glucuronide | | Details |
| 4-oxo-13-cis-retinoic acid DBMET02552 |  | Not Available | 4-oxo-all-trans-retinoic acid |  | Details |
| 4-oxo-all-trans-retinoic acid DBMET02550 | | Not Available | 4-oxo-13-cis-retinoic acid | | Details |
| 4-Oxoretinoic acid DBMET00455 | | UDP-glucuronosyltransferase 2B7 | 4-Oxoretinoic acid glucuronide |  | Details |
| 4-phthalimidoglutaramic acid DBMET01115 |  | Not Available | 4-(o-carboxybenzamido)glutaramic acid |  | Details |
| 4-phthalimidoglutaramic acid DBMET01115 | | Not Available | 2-phthalimidoglutaric acid |  | Details |
| 4-Sulfonyloxy dexlansoprazole DBMET03755 |  | Not Available | 4-Sulfonyloxy dexlansoprazole sulfide |  | Details |
| 4-Trifluoromethylphenol DBMET00198 |  | Cytochrome P450 2C19 / Cytochrome P450 3A4 | Hippuric acid |  | Details |