Is the interest here that the molecule has a double bond in a three-membered ring? It's pretty strained but far from the weirdest cyclic systems. There are so

Is the interest here that the molecule has a double bond in a three-membered ring? It's pretty strained but far from the weirdest cyclic systems. There are some cycloallenes with two sequential double bonds, https://pubs.rsc.org/en/content/articlelanding/2015/qo/c5qo00072f https://pubs.rsc.org/en/content/articlelanding/2015/qo/c5qo0... You can also get triple bonds in a large enough ring https://en.m.wikipedia.org/wiki/Cycloalkyne https://en.m.wikipedia.org/wiki/Cycloalkyne