molrender: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/molrender - from package: mpqc-support

You may install the required package with command apt-get install {package}
Error in other languages:
molrender: bevel nie gevind nie
molrender: comandă negăsită
molrender: comando não encontrado
molrender: commande introuvable
molrender: command not found
molrender: käsku ei ole
molrender: không tìm thấy lệnh
molrender: komanda nerasta
molrender: Kommando nicht gefunden.
molrender: kommandot finns inte
molrender: komut yok
molrender: nie znaleziono polecenia
molrender: níor aimsíodh an t-ordú
molrender: no se encontró la orden
molrender: no s'ha trobat l'ordre
molrender: opdracht niet gevonden
molrender: parancs nem található
molrender: perintah tidak ditemukan
molrender: príkaz nenájdený
molrender: příkaz nenalezen
molrender: команда не найдена
molrender: командата не е открита
molrender: 命令找不到
molrender: コマンドが見つかりません