A non-trivial aspect to consider could be specific interactions of the end groups of the tetra-stars used by us. In contrast to the Sakai gels, one tetra-star possesses aromatic oxazinone terminal groups, which are assumed to interact with each other or with the linking groups formed during the synthesis by favorable van-der-Waals or  interactions. The polar nitro substituent on the oxazinone group could further enhance specific interactions. The resulting increase in local concentration of oxazinone groups could promote a formation of double links.