<|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: all relevant data are within the paper and its supporting information files, except for x-ray structural data deposited in the cambridge structural database under the accession number ccdc 1416250 containing the supplementary crystallographic data for 6. these data can be obtained free of charge via http://www.ccdc.cam.ac.uk/conts/retrieving.html, or from the cambridge crystallographic data centre, 12 union road, cambridge cb2 1ez, uk; email: deposit@ccdc.cam.ac.uk.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>