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I came across a SMILES notation I don't know in the DSSTox database. Here's an example:
OS(=O)(=O)CCCNCCNC(=O)C(F)(F)F |lp:0:2,2:2,3:2,7:1,10:1,12:2,14:3,15:3,16:3,Sg:n:13,15,14:4-8:ht|
The beginning is as I would expect, but it is followed by a series of descriptors between vertical bars $\vert$...