| MZ-3 | Z8K5NC7UKG | chemical |
| Mabuprofen | 02B8S6J90B | chemical |
| Mabuprofen, (R)- | 62C4HZ8R69 | chemical |
| Mabuprofen, (S)- | 2AYB6993KW | chemical |
| Macadamia Integrifolia Seed Oil | 7VK9GL8RUP | structurallyDiverse |
| Macbecin I | GB3Z258LF8 | chemical |
| Macitegtagene Autoleucel | QQ55NF53RR | structurallyDiverse |
| Macitegtagene autoleucel expressed chimeric antigen receptor (CAR) targeting the intercellular adhesion molecule-1 (ICAM-1) | C5Z3F98QQV | protein |
| Macitegtagene autoleucel expressed human somatostatin receptor type 2 | W4VZJ87D9E | protein |
| Macitegtagene autoleucel expressed preprotein (CAR targeting ICAM-1fused to human somatostatin receptor type 2 (SSTR2) separates by P2A peptide) | Q6ND6YVF2C | protein |
| Macitegtagene autoleucel lentiviral vector | ELY7WDV57K | structurallyDiverse |
| Macitegtagene autoleucel transgene insert | LV296BSH6N | nucleicAcid |
| Macitentan | Z9K9Y9WMVL | chemical |
| Macitentan-Pyrimidine-N-propyl | G35EY3TW4W | chemical |
| Macluraxanthone | 9GN3KT96MT | chemical |
| Macrocarpal H | 3V5VQV46B4 | chemical |
| Macrocystis Pyrifera | K31S3OG5C4 | structurallyDiverse |
| Macronecine, ( )- | D2P2A4GF4J | chemical |
| Macronecine, (+)- | XU327N5D2A | chemical |
| Macronecine, (-)- | J7G72AJ4V7 | chemical |
| Macrophylline | 92GE6XN566 | chemical |
| Macropsychanthus comosus whole | OGI783GV9O | structurallyDiverse |
| Macropsychanthus grandiflorus whole | 7N151X9L2U | structurallyDiverse |
| Macropsychanthus megacarpus whole | 0C21626WMB | structurallyDiverse |
| Macropsychanthus violaceus whole | YO2CV61N9Y | structurallyDiverse |
| Macrosporin | H7Y9P85TLB | chemical |
| Macupatide | YWF427CA5D | protein |
| Maggiemycin | F7Z2CYM3PB | chemical |
| Magnesium | I38ZP9992A | chemical |
| Magnesium 2-methylbenzenesulfonate | EK45HPH745 | chemical |
| Magnesium 2-methylpropan-2-olate | Q6WGM79L4Z | chemical |
| Magnesium 2-methylpropanolate | W395Y27TFS | chemical |
| Magnesium 3-hydroxybutyrate | 72U3344SHQ | chemical |
| Magnesium 4-((dipropylamino)sulfonyl)benzoate | SMZ9Y73AMQ | chemical |
| Magnesium 4-tert-butylbenzoate | W2TSN2S4Y2 | chemical |
| Magnesium 5-cyano-2-(4-fluorobenzoyl)benzyl alcohol bromide | QY99RDY5U7 | chemical |
| Magnesium 6-bromo-3-pyridinide bromide | H9457H8FW6 | chemical |
| Magnesium 7-theophyllineacetate | K8UFK64BX3 | chemical |
| Magnesium 8-aminonaphthalene-1-sulfonate | R69NS6WNT3 | chemical |
| Magnesium Citrate | RHO26O1T9V | chemical |
| Magnesium Oxybate Heptahydrate | PC6D3LGA97 | chemical |
| Magnesium abietate | VND7CN6K8Z | chemical |
| Magnesium acetate tetrahydrate | I01G0EJC3B | chemical |
| Magnesium ascorbate monohydrate | S3XY7S2BFH | chemical |
| Magnesium aspartate dihydrate | Y4F5ODM66L | chemical |
| Magnesium bis(8-hydroxyquinolinate) | XM33RP5REF | chemical |
| Magnesium bis[2-chloro-5-formylbenzenesulfonate] | 5XVQ95BQ24 | chemical |
| Magnesium bis[8-(phenylamino)-1-naphthalenesulfonate] | A9JT6A24EV | chemical |
| Magnesium citrate nonahydrate | I10B9YK3MA | chemical |
| Magnesium decanolate | S7FSH2RE3X | chemical |