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viewstr(smis)
viewstr(c("c1ccc2ccc3c(NCCN(C)C)cc(nc3c2c1)", "c1ccc2ccc3c(NCCN(CC)CCCl)cc(nc3c2c1)", "c1ccc2ccc3c(NC(CC)CC)cc(nc3c2c1)", "c1ccc2ccc3c(c2c1)ncc(c3NCCNCC=CCCCC)"))
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