By incorporation of an azobenzene unit , a photoswitchable version of capsazepine ( AC4 ) was developed in 2013 that allows for optical control of TRPV1 channels with light .
By incorporation of an azobenzene unit , a optical version of capsazepine ( AC4 ) was developed in 2013 that allows for photoswitchable control of TRPV1 channels with light .