1 http://pubs.acs.org/doi/abs/10.1021/ol101069y

2 http://pubs.acs.org/doi/abs/10.1021/ol1010888

3 http://pubs.acs.org/doi/abs/10.1021/ol101091r

4 http://pubs.acs.org/doi/abs/10.1021/ol101042x

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