Fine Chemicals & Nucleoside Building Blocks
From R&D to Scale-Up
Kilogram-to-Ton Manufacturing
Flexible batch production supported by standardized processes and quality control
Solutions for Complex Chemistry
Route design, custom synthesis and process development for challenging projects
Fine Chemicals & Nucleoside Building Blocks
From R&D to Scale-Up
Kilogram-to-Ton Manufacturing
Flexible batch production supported by standardized processes and quality control
Solutions for Complex Chemistry
Route design, custom synthesis and process development for challenging projects
why orihar
Why Orihar
Orihar is a Shanghai-based, technology-driven chemical company specializing in nucleoside building blocks, pharmaceutical intermediates, and custom chemistry for pharmaceutical, biotechnology, and research customers worldwide.
We combine chemistry expertise, process development, quality-focused execution, and flexible supply—from catalog products and custom synthesis to scale-up support—to help customers move projects forward with confidence.
100 +
Specialty Products & Building Blocks
1000 +
kg to MT Scalable Manufacturing
20 +
Years of R&D Expertise
5000
㎡ GMP Production Workshop
Our Core Expertise
Nucleoside Chemistry
We provide DNA and RNA phosphoramidites, LNA/ENA building blocks, PMO monomers, oligonucleotide modifiers and related specialty reagents for research and development.
Pharmaceutical Intermediates
Our portfolio includes heterocyclic compounds, halogenated intermediates and specialized building blocks for pharmaceutical and fine-chemical applications.
Custom Chemistry
From route evaluation and custom synthesis to process development and scale-up support, we provide solutions tailored to specific structure, purity and volume requirements.
Our Core Expertise
Nucleoside Chemistry
We provide DNA and RNA phosphoramidites, LNA/ENA building blocks, PMO monomers, oligonucleotide modifiers and related specialty reagents for research and development.
Pharmaceutical Intermediates
Our portfolio includes heterocyclic compounds, halogenated intermediates and specialized building blocks for pharmaceutical and fine-chemical applications.
Custom Chemistry
From route evaluation and custom synthesis to process development and scale-up support, we provide solutions tailored to specific structure, purity and volume requirements.
Products
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3,5-Di-tert-butyl-o-benzoquinone CAS 3383-21-9
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dSpacer CE Phosphoramidite CAS 129821-76-7
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5'-Thiol Modifier C6 Disulfide CAS 148254-21-1
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Inverted Abasic Phosphoramidite CAS 401813-16-9
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1-(3-Chlorophenyl)-2-[[(4-methylphenyl)sulfonyl]oxy]-1-propanone CAS 2810945-03-8
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1-(4-Chlorophenyl)-2-[[(4-methylphenyl)sulfonyl]oxy]-1-propanone CAS 25917-51-5
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2-[[(4-Methylphenyl)sulfonyl]oxy]-1-phenyl-1-pentanone CAS 1358706-23-6
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α-Methylbenzenepropanamide CAS 7499-19-6
![1-(3-Chlorophenyl)-2-[[(4-methylphenyl)sulfonyl]oxy]-1-propanone CAS 2810945-03-8](https://gcdn.meidianbang.cn/comdata/83746/product/20261023110128C724B4F83BE3DD8C_s.png "1-(3-Chlorophenyl)-2-[[(4-methylphenyl)sulfonyl]oxy]-1-propanone CAS 2810945-03-8")
![1-(4-Chlorophenyl)-2-[[(4-methylphenyl)sulfonyl]oxy]-1-propanone CAS 25917-51-5](https://gcdn.meidianbang.cn/comdata/83746/product/20261023110128AE32AA7E220A9704_s.png "1-(4-Chlorophenyl)-2-[[(4-methylphenyl)sulfonyl]oxy]-1-propanone CAS 25917-51-5")
![2-[[(4-Methylphenyl)sulfonyl]oxy]-1-phenyl-1-pentanone CAS 1358706-23-6](https://gcdn.meidianbang.cn/comdata/83746/product/2026102311012984A59FBF4C07F9FA_s.png "2-[[(4-Methylphenyl)sulfonyl]oxy]-1-phenyl-1-pentanone CAS 1358706-23-6")
Insights
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Modified Nucleosides in Oligonucleotide Research
Oct 19, 2026
A high-level review of why researchers use sugar, base, backbone and conjugation modifications in oligonucleotide design.
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How to Select a Reliable Supplier for Nucleoside Building Blocks
Oct 19, 2026
Five practical areas to review when evaluating a supplier: product identity, analytical information, batch consistency, packaging and technical communication.
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Custom Synthesis from Product Inquiry to Delivery
Oct 19, 2026
A step-by-step explanation of the information, evaluation, confirmation and communication involved in a custom synthesis project.
