Now, in between those two parts of boron chemistry, the gas phase analysis and the metalloboranes, was another field which became possible and that was we learnt how by certain reactions to make what we called conjuncto-boranes. In other words, boron units which were conjoined, joined together, so that instead of forming multicentre bonds we made a B-B bond or other sorts of bonds. And it turned out that we were able to do this because by reacting, say, thermolising, heating up decaborane... as you know one of the products of decaborane reactions is a gunge... a polymer, and no-one had any clear ideas what the structure was so we worked this up into separate fractions and were able to show first by mass spectrometry and then by NMR [nuclear magnetic resonance], which was also a very valuable technique, boron or proton-decoupled with boron and so forth, to work out what the chemical structures of these were and they were complex borane clusters conjoined either by boron-boron bonds or by sideways bonding or three in a triangle and so forth and we got B₂₀ compounds, B₃₀ compounds and could be quite certain that it was what we were saying because we also did the mass spectrometry and counted up the masses precisely and got the chemical compounds.