What is the mental state element required for a first degree felony murder based on robbery or an attempt to commit robbery?

The specific intent to commit robbery is the mental state element required for first degree felony murder based on robbery or an attempt to commit robbery. (People v. Friend (2009) 47 Cal.4th 1, 49.) "[A]n aider and abettor will 'share' the perpetrator's specific intent when he or she knows the full extent of the perpetrator's criminal purpose

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and gives aid or encouragement with the intent or purpose of facilitating the perpetrator's commission of the crime." (People v. Beeman (1984) 35 Cal.3d 547, 560.)