methotrexate molecular structure, 3d model molecule, amethopterin, structural chemical formula view from a microscope

methotrexate amethopterin mtx microscope molecule transparent molecular structure chemical formula model c20h22n8o5 bubble air glass atom oxygen nitrogen carbon hydrogen pharmaceutical acid generic cancer pharmacy pregnancy chemistry drug science treatment arthritis disease medicine tumor atomic chemotherapy pharmacology lupus abortion psoriasis autoimmune antifolate antimetabolite methotrexat reductase rheumatoid sarcoidosis teratogenic structural view from microscope