Does Canvas support all the standard SMARTS features?

Canvas supports the standard SMARTS features with the following exceptions:

• Degree syntax Dn, which specifies the number of heavy atom connections
• Distinction between implicit and explicit hydrogens (H vs. h)
• SSSR ring count Rn. Canvas distinguishes ring and non-ring atoms with R1 and R0, but R1 matches all n > 0.

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