The Chemical Entities of Biological Interest (ChEBI) ontology is downloaded weekly from EMBL-EBI at http://www.ebi.ac.uk/chebi/. The data is made available under the Creative Commons License (CC BY 3.0, http://creativecommons.org/licenses/by/3.0/). For more information see: Degtyarenko et al. (2008) ChEBI: a database and ontology for chemical entities of biological interest. Nucleic Acids Res. 36, D344–D350.
A diamine in which two primary amino groups are at either end of what is essentially a poly(ethylene glycol) (PEG)backbone, consisting of blocks of ethylene oxide and propylene oxide. In the diagram, m ~ 39,; (l + n) ~ 6. The compound is one of a series of related compounds commonly used to crystallise proteins.