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Table 5 A collection of SMILES attributes that can be interpreted as promoters of activity or inactivity of compounds against 3CLPro

From: SMILES-based QSAR virtual screening to identify potential therapeutics for COVID-19 by targeting 3CLpro and RdRp viral proteins

SMILES attribute

Interpretation

Promoter of activity increase

 O… = ……

Presence of aliphatic oxygen and double bond

  +  +  +  + N–-B2 =  = 

Presence of nitrogen and double bond

  = …O … (…

Presence of aliphatic oxygen and double bond and branching

 C…C……

Presence of two successive aliphatic carbon

 C… = … (…

Presence of aliphatic carbon and double bond with branching

 BOND10000000

Presence of double bond in the structure of compound

 C…3……

Presence of at least three rings

 C … (… = …

Presence of carbon and double bond and branching

 C…N … (…

Presence of aliphatic carbon and aliphatic nitrogen and branching

 C…O … (…

Presence of aliphatic carbon and aliphatic oxygen and branching

 C…2… = …

Presence of at least two rings and double bond

 NOSP11000000

Molecule contains nitrogen and oxygen

 1… (……

Presence of at least one ring with branching

Promoter of activity decrease

  +  +  +  + N–-O =  =  = 

Presence of nitrogen and oxygen and double bond

  +  +  +  + O–-B2 =  = 

Presence of oxygen and double bond

 C…C…C…

Presence of three successive aliphatic carbon

 C… = …3…

Presence of aliphatic carbon and double bond and at least three rings

 H…@……

Presence of hydrogen and stereo specific bonds