polylactic acid molecule 3d, molecular structure, ball and stick model, structural chemical formula thermoplastic polyester

polylactic acid thermoplastic polyester polylactide pla molecule molecular structure chemical formula model c3h6o3x atom carbon oxygen renewable sustainable atomic hydrogen implant plastic polymer synthetic tapioca monomer printing recycling strand corn fiber particle lactic medical compostable lactate bioplastic polylactate chemistry skeletal icon flat science structural illustration ball stick polyester