Compound: Menadiol
SMILES: Oc1c2c(c(O)cc1C)cccc2
InChIKey: ZJTLZYDQJHKRMQ-UHFFFAOYSA-N
Synonyms: Menadiol, 2-Methylnaphthalene-1,4-diol, 481-85-6, 2-Methyl-1,4-naphthohydroquinone, 2-Methyl-1,4-naphthalenediol, Vitamin K3H2, Dihydrovitamin K3, Reduced menadione, Methylnaphthohydroquinone, Reduced vitamin K3, 2-Methylhydronaphthoquinone, 2-Methyl-1,4-naphthoquinol, DTXSID5023247, VQ093653DO, CHEBI:6746, DTXCID703247, RefChem:5993, 207-573-8, MFCD00655068, Menadiol [BAN], 1,4-dihydroxy-2-methylnaphthalene, 2-Methyl-1,4-dihydroxynaphthalene, Menadiol (BAN), NCGC00164511-01, Menadiol [USAN], CAS-481-85-6, EINECS 207-573-8, BRN 1638194, UNII-VQ093653DO, 1,4-NAPHTHALENEDIOL, 2-METHYL-, Menadiol [USAN:BAN], MENADIOL [MI], MENADIOL [VANDF], Vitamin K2 Impurity 15, MENADIOL [WHO-DD], Oprea1_703615, SCHEMBL297164, SCHEMBL5028387, SCHEMBL7557418, 2-Methyl-naphthalene-1,4-diol, CHEMBL1405447, SCHEMBL25358277, SCHEMBL29525544, 1,4-dihydroxy-2-methyl-naphthalene, Tox21_112146, Tox21_113729, MSK162307, AKOS006242259, EBC-380051, FM67358, HY-W128525, s12105, NCGC00164511-02, NCGC00253592-01, AS-11639, SY240082, CS-0186672, NS00007586, C07126, D08175, F542398, Q192430, SR-01000944959, A1-03295, SR-01000944959-1
Theoretical properties:
molecular_formula: C11H10O2
molecular_weight: 174.20 g/mol
exact_mass: 174.068079557 g/mol
formal_charge: 0
hydrogen_bond_donor_count: 2
hydrogen_bond_acceptor_count: 2
rotatable_bond_count: 0
heavy_atom_count: 13
topological_polar_surface_area: 40.5 Å²
isotope_atom_count: 0
covalently_bonded_unit_count: 1
Physical properties:
Descriptions:
pubchem: Menadiol is a naphthalene-1,4-diol having a methyl substituent at the 2-position. It is a member of naphthalenediols, a member of methylnaphthalenes and a naphthohydroquinone. It is functionally related to a naphthalene-1,4-diol.
chebi: A naphthalene-1,4-diol having a methyl substituent at the 2-position.
chembl: VITAMIN K3H2 is a small molecule listed in the ChEMBL database but has not progressed to an approved clinical phase.
wikipedia: Menadiol is an organic compound with the formula C6H4(COH)2(CH)(CH3).  It is formally the p-hydroquinone derivative of 2-methylnaphthalene. The name vitamin K4 can refer to:

specifically this compound,
its various esters, e.g.
menadiol diacetate (acetomenaphthone),
menadiol dibutyrate,
menadiol dimalonate, or
its various salts, like
menadiol sodium diphosphate (Kappadione)
menadiol sodium disulfate.
Menadiol sodium diphosphate is approved in the UK for treatment and prevention of haemorrhage, mainly in obstructive jaundice (before and after surgery). Unlike natural, lipophilic forms of vitamin K, menadiol sodium diphosphate does not require bile for absorption, hence the use in obstructive jaundice. A disadvantage is that it takes 24 hours to show effects, though the effects do last for several days. It can cause hemolytic anemia, more commonly in people with glucose 6-phosphate dehydrogenase deficiency or vitamin E deficiency.
Menadiol is probably naturally produced by reduction of menadione ("vitamin K3"; see Quinone § Reduction) as an intermediate in the conversion from K3 to MK-4. It can be oxidized in experimental conditions back to menadione.