1417001 USP


United States Pharmacopeia (USP) Reference Standard

Synonym: 8-MOP, 8-Methoxypsoralen, 9-Methoxyfuro[3,2-g][1]benzopyran-7-one, Ammoidin, Methoxsalen, Xanthotoxin

  • CAS Number 298-81-7

  • Empirical Formula (Hill Notation) C12H8O4

  • Molecular Weight 216.19

  •  Beilstein/REAXYS Number 196453

  •  MDL number MFCD00005009

  •  PubChem Substance ID 329750415

  •  NACRES NA.24



Related Categories Analytical Standards, Analytical/Chromatography, Pharmacopeia & Metrological Institutes Standards, USP Standards, USP Standards L - M More...
mp   148-150 °C (lit.)
Featured Industry   Pharmaceutical (small molecule)


General description

This product is provided as delivered and specified by the issuing Pharmacopoeia. All information provided in support of this product, including SDS and any product information leaflets have been developed and issued under the Authority of the issuing Pharmacopoeia.
For further information and support please go to the website of the issuing Pharmacopoeia.

Biochem/physiol Actions

8-methoxypsoralen (8-MOP) plus ultraviolet A (UVA) irradiation induces monoadducts and interstrand cross-links in DNA and therefore can be used to study DNA repair and recombination mechanisms. Cultured normal human melanocytes treated with 8-methoxypsoralen and irradiated with ultraviolet A (UVA) formed 8-methoxypsoralen-phospholipid photoadducts that could be substituted for diacylglycerol to activate protein kinase C in a cell-free system. 8-MOP is an inactivator of purified reconstituted cytochrome P450. It also inhibits substance P-induced histamine release from substance P-activated rat peritoneal mast cells by suppressing the rise in [Ca2+].

Analysis Note

These products are for test and assay use only. They are not meant for administration to humans or animals and cannot be used to diagnose, treat, or cure diseases of any kind.  ​

Other Notes

USP issued SDS can be found here.

Sales restrictions may apply.

Safety & Documentation

Safety Information

NONH for all modes of transport


Certificate of Analysis (COA)

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