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Clearsynth is a leading innovator in pharmaceutical reference standards, offering high-quality Reference Standards for Phenytoin, including both pharmacopeial and non-pharmacopeial impurities, metabolites, stable isotope products, and nitrosamines (N-NO products). Our Phenytoin impurity reference standards are invaluable for pharmaceutical research, supporting product development, ANDA and DMF submissions, quality control (QC), method validation, and stability studies. They also aid in identifying unknown impurities and assessing genotoxic potential.
Our Phenytoin-related products undergo thorough characterization and are supplied with detailed Certificates of Analysis (COA) and analytical data that meet regulatory requirements. All supplied products are re-tested at regular intervals to ensure ongoing quality and compliance.

Phenytoin Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(+/-)-4-Hydroxy Mephenytoin-d3 Stable Isotopes CS-T-56128 1173022-56-4 In Stock
dl-5-(4-Hydroxyphenyl)-5-Phenyl-Hydantoin-1,3-15N2,d5 Stable Isotopes CS-BU-00041 2784-27-2 (Unlabelled) In Stock
Fosphenytoin Sodium-d10 Stable Isotopes CS-T-100280 93390-81-9(Unlabelled) Enquire
Mephenytoin-d8 Stable Isotopes CS-W-00413 50-12-4(Unlabelled) In Stock
Phenytoin-d10 Stable Isotopes CS-O-02749 65854-97-9 In Stock
Phenytoin-d5 Stable Isotopes CS-B-00352 57-41-0 (unlabelled) Enquire
rac-Mephenytoin-d3 Stable Isotopes CS-T-57497 1185101-86-3 In Stock
rac-Mephenytoin-d5 Stable Isotopes CS-T-57498 1185032-66-9 In Stock
rac-N-Desmethyl Mephenytoin-d5(Major) Stable Isotopes CS-T-52246 119458-27-4 In Stock


API

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(S)-Mephenytoin API CS-T-31814 70989-04-7 In Stock
Mephenytoin API CS-EK-01429 50-12-4 Enquire
Phenytoin API CS-O-02145 57-41-0 In Stock
Phenytoin Sodium API CS-O-02068 630-93-3 In Stock
(R)-Mephenytoin API CS-T-31813 71140-51-7 Enquire
Fosphenytoin API CS-ED-02004 93390-81-9 Enquire


Metabolite

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
3-Hydroxy Phenytoin Metabolite CS-T-28236 30074-03-4 In Stock
4-Hydroxyphenytoin Metabolite CS-Q-00205 2784-27-2 Enquire


Impurity

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(+/-)-4-Hydroxy Mephenytoin Impurity CS-T-56127 61837-65-8 In Stock
(S)-4-Hydroxy Mephenytoin Impurity CS-T-27668 82695-93-0 In Stock
Fosphenytoin Cyclohexyl impurity Impurity CS-O-43231 Not Available Enquire
Phenytoin Related Compound A Impurity CS-T-53819 3060-50-2 In Stock
Phenytoin Sodium EP Impurity B Impurity CS-O-31145 134-81-6 In Stock
Diphenylglycinamide impurity Impurity CS-ED-01449 15427-81-3 Enquire
Phenytoin arene-oxide Impurity CS-ED-42369 ---- Enquire
R-(-)-N-Desmethyl Mephenytoin Impurity CS-T-52247 65567-32-0 Enquire
rac N-Desmethyl Mephenytoin Impurity CS-T-52245 631-07-2 Enquire


Intermediate

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Fosphenytoin Sodium Intermediate CS-T-24814 92134-98-0 In Stock


Glucuronide

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
4-Hydroxyphenytoin Glucuronide Glucuronide CS-ED-01004 53819-79-7 Enquire


Nitrosamine

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
N-nitroso Mephenytoin Nitrosamine CS-O-39145 Not Available Enquire


Secondary Standards

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Phenytoin Secondary Standards CS-SS-24182-1GM 57-41-0 Enquire
Phenytoin Impurity F Secondary Standards CS-SS-25373-100MG 266.29 Enquire
Phenytoin Related Compound B Secondary Standards CS-SS-24647-100MG 6802-95-5 Enquire
Phenytoin sodium Secondary Standards CS-SS-24475-1GM 630-93-3 Enquire