Active PharmaceuticalIngredients (API)

Clearsynth API division

Deuterated APIs
ADHD APIs
Oncology APIs

Advanced APIs • Intermediates • Reagents

Clearsynth API manufacturing campus — API manufacturing campus

Clearsynth research and development facility — Clearsynth R&D facility

Clearsynth scientist conducting laboratory research — Scientific research

Clearsynth scientist working with analytical instrumentation — Analytical instrumentation

Clearsynth scientists reviewing laboratory documentation for API development — Scientific expertise for API manufacturing

API Overview

Active Pharmaceutical Ingredients

Clearsynth develops and manufactures active pharmaceutical ingredients, advanced intermediates and reagents for customer programs in deuterated, ADHD and oncology-focused chemistry. Our teams connect research expertise with process understanding, analytical control and manufacturing execution to support reliable progression from development to supply.

Scientific depth, operational discipline and consistent quality systems guide every project. Cross-functional collaboration brings process chemists, analytical scientists, quality specialists and manufacturing teams together around the molecule, intended market and delivery requirement.

Read about deuterated API development, isotope control and manufacturing →

Clearsynth API manufacturing materials facility — API manufacturing operations

Clearsynth API process plant with production reactors — API process manufacturing plant

Our Ever-Growing Portfolio

15+APIs

40+Intermediates

170+Deuterated Reagents

Technical capabilities

Scientific control from development through scale-up

Integrated chemistry, analytical science and manufacturing support help move each program forward with clarity and control.

Process development & scale-up

Route assessment, process optimization, process safety and scale progression aligned with the molecule and project requirement.

Impurity & analytical control

Impurity understanding, analytical method development and fit-for-purpose testing support consistent decision-making.

Solid form & stability

Crystallization, salt, polymorph and stability studies are planned around isolation, handling and downstream needs.

Manufacturing readiness

Batch planning, equipment fit, process safety and in-process controls support dependable API production.

Facilities & infrastructure

Built for scientific depth and manufacturing scale

Clearsynth’s API infrastructure supports synthetic organic small molecules and complex chemistry from milligram development through multi-kilogram manufacture. A 225 kL manufacturing platform is supported by 350+ scientists and 100+ process chemists, with systems for process safety, analytical control, manufacturing readiness and regulatory-aligned execution.

225 kLManufacturing capacity

350+Scientists

100+Process chemists

Intellectual Property History

Innovation supported by a growing patent portfolio

Clearsynth continues to develop and protect intellectual property arising from its research, process-development and API programs.

180+Patents filed

10Patents granted

Discuss your API requirement

Connect directly with our API team for APIs, intermediates and deuterated reagents.