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Mol: C12CC(CC1)CC2
Options: 
Ring: atoms(a1 a2 a3 a4 a5); bonds(b1 b2 b3 b4 b5); aromatic(0)
Ring: atoms(a1 a2 a3 a6 a7); bonds(b1 b2 b6 b7 b8); aromatic(0)