⚛️₁₂➡️[⚛️₁₂]ₙ

#copolymer notation #polymer formula #repeating unit #monomer a #monomer b #polymer science #chemical structure representation

···+

#partial bond positive #dotted line bond #polar covalent bond #positive end notation #chemical structure representation

✳️✳️🅿️↔️³↔️🅿️✳️✳️

#dtbpp #tert-butyl group structure #phosphine ligand #propane backbone #chemical structure representation #organophosphorus