Update README.md

README.md

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-license: cc-by-nc-4.0
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+---
+license: cc-by-nc-4.0
+size_categories:
+- 100K<n<1M
+tags:
+- chemistry
+- molecules
+- smiles
+- building-blocks
+- synthesis
+---
+# Molport In-Stock Building Blocks Database
+
+The **Molport In-Stock Building Blocks Database** contains SMILES strings and Molport IDs for over **800,000 building blocks** that are currently available for purchase. These compounds represent a diverse collection of reagents and intermediates designed to support **medicinal chemistry, drug discovery, and custom synthesis workflows**.
+
+## Contents
+- **SMILES** – The molecular structure in [SMILES notation](https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system).
+- **SMILES_CANONICAL** – Canonicalized SMILES representation.
+- **MOLPORTID** – Unique Molport identifier for each compound.
+
+## Scope
+This dataset includes:
+- **All in-stock building blocks** listed at [molport.com](https://www.molport.com)
+- Molecules available for purchase either:
+  - Directly via the [Molport website](https://www.molport.com), or
+  - By contacting our sales team at **sales@molport.com**.
+
+## Update Frequency
+- Files are updated on a **monthly basis** to reflect the latest in-stock availability.
+
+## Licensing
+- Licensed under **CC BY-NC 4.0** — you may use this dataset for internal, non-commercial purposes with attribution to Molport.
+- Commercial resale, redistribution, or inclusion in commercial offerings is **prohibited**.