We have teachers in Chemistry who need students to be able to 'draw' and submit such mystical things as this:

[edit: this image won't embed for some reason but you can see it here]

I've seen feature requests for stylus drawing in Canvas (like this one), but what would be even better is an  tool that assists students in creating these... errr... molecules(???), and even better, if this tool could be surfaced in Canvas so students can create and submit, all within the LMS.

Does anybody use/know of such a thing?? So far I've found these:

• chemdraw
• chemicalize
• chemdoodle