[NTG-context] small caps italic and font switching inside math

Hello, I have to tiny questions: 1. How do I get small caps [bold] italic (except with the \definedfont[ec-lmxxx])? 2. I defined \molecule to be \def\molecule#1{$\rm#1$}, an usage example would be: \molecule{HSO_4^{-}} But how should I modify this it so that it would also work properly with examples such as: {\bfa A story about \molecule{SF_6}} {\scx A story about \molecule{SF_6}} {\bsb A story about \molecule{SF_6}} As a workaround I now keep hardcoding \molecule{\bsb SF_6}. Thanks, Mojca