_:n3e19e5a9fb6248ce8d7fc08cb875a128xb0
<http://schema.org/url>
<https://es.coursera.org/instructor/doriancanelas>
<https://es.coursera.org/lecture/basic-chemistry/simple-structure-formal-charge-and-resonance-part-i-bPSdP?authMode=signup>