Text and Data Mining valid from 2018-10-04
Received: 24 August 2018
Accepted: 27 September 2018
First Online: 4 October 2018
Conflict of interest
: The authors declare no conflicts of interest.
: This article does not contain any studies with human participants performed by any of the authors.
: CCDC 1586067 and 1586068 contain supplementary crystallographic data for L and 1, respectively. These data can be obtained free of charge via ExternalRef removed or the Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, UK; fax: (+44) 1223-336-033; or e-mail: email@example.com.