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Clearsynth is a leading innovator in pharmaceutical reference standards, offering high-quality Reference Standards for Phthalide, including both pharmacopeial and non-pharmacopeial impurities, metabolites, stable isotope products, and nitrosamines (N-NO products). Our Phthalide 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 Phthalide-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.

Phthalide Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
3-Butylidene Phthalide-d8 Stable Isotopes CS-T-101748 1795142-65-2 Enquire
3-Butylphthalide-d3 Stable Isotopes CS-T-94834 2399464-57-2 Enquire
3-Butylphthalide-D9 Stable Isotopes CS-T-101741 Not Available Enquire
Butylphthalide D7(NBP D7) Stable Isotopes CS-O-47499 Not Available Enquire


Impurity

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
3-(4-Chlorobenzal)phthalide Impurity CS-T-11185 20526-97-0 In Stock
3-Benzylphthalide Impurity CS-O-54749 7011-98-5 Enquire
5-Cyanophthalide Impurity CS-O-06295 82104-74-3 In Stock


Fine Chemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
5 Aminophthalide Fine Chemicals CS-M-05254 65399-05-5 In Stock
5-Carboxyphthalide Fine Chemicals CS-T-70537 4792-29-4 Enquire


Building Blocks

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
3,3'-Diphthalide Building Blocks CS-ED-00967 4281-21-4 Enquire


Stable Isotope Reagent

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Phthalide 13C6 Stable Isotope Reagent CS-T-103522 27355-22-2(unlabelled) Enquire