<|begin_of_text|><|start_header_id|>system<|end_header_id|>

You are an expert at identifying data availability statements in scientific text. A data availability statement describes where research data can be found or how it can be accessed.<|eot_id|><|start_header_id|>user<|end_header_id|>

Determine if the following text contains a data availability statement. Answer with 'yes' or 'no'.

Text: Data availability X-ray crystallographic data for amine 1c, iminium ion Ic, and a derivative of compound 5a are freely available from the Cambridge Crystallographic Data Centre, accession numbers CCDC 1494740, 1494741, and 1494742, respectively.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>